Robert J Hilsden

The University of Calgary, Calgary, Alberta, Canada

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Publications (110)532.28 Total impact

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    ABSTRACT: To evaluate the incidence, surgery, mortality, and readmission of upper gastrointestinal bleeding (UGIB) secondary to peptic ulcer disease (PUD). Administrative databases identified all hospitalizations for UGIB secondary to PUD in Alberta, Canada from 2004 to 2010 (n = 7079) using the International Classification of Diseases Codes (ICD-10). A subset of the data was validated using endoscopy reports. Positive predictive value and sensitivity with 95% confidence intervals (CI) were calculated. Incidence of UGIB secondary to PUD was calculated. Logistic regression was used to evaluate surgery, in-hospital mortality, and 30-d readmission to hospital with recurrent UGIB secondary to PUD. Co-variants accounted for in our logistic regression model included: age, sex, area of residence (i.e., urban vs rural), number of Charlson comorbidities, presence of perforated PUD, undergoing upper endoscopy, year of admission, and interventional radiological attempt at controlling bleeding. A subgroup analysis (n = 6356) compared outcomes of patients with gastric ulcers to those with duodenal ulcers. Adjusted estimates are presented as odds ratios (OR) with 95%CI. The positive predictive value and sensitivity of ICD-10 coding for UGIB secondary to PUD were 85.2% (95%CI: 80.2%-90.2%) and 77.1% (95%CI: 69.1%-85.2%), respectively. The annual incidence between 2004 and 2010 ranged from 35.4 to 41.2 per 100000. Overall risk of surgery, in-hospital mortality, and 30-d readmission to hospital for UGIB secondary to PUD were 4.3%, 8.5%, and 4.7%, respectively. Interventional radiology to control bleeding was performed in 0.6% of patients and 76% of these patients avoided surgical intervention. Thirty-day readmission significantly increased from 3.1% in 2004 to 5.2% in 2010 (OR = 1.07; 95%CI: 1.01-1.14). Rural residents (OR rural vs urban: 2.35; 95%CI: 1.83-3.01) and older individuals (OR ≥ 65 vs < 65: 1.57; 95%CI: 1.21-2.04) were at higher odds of being readmitted to hospital. Patients with duodenal ulcers had higher odds of dying (OR = 1.27; 95%CI: 1.05-1.53), requiring surgery (OR = 1.73; 95%CI: 1.34-2.23), and being readmitted to hospital (OR = 1.54; 95%CI: 1.19-1.99) when compared to gastric ulcers. UGIB secondary to PUD, particularly duodenal ulcers, was associated with significant morbidity and mortality. Early readmissions increased over time and occurred more commonly in rural areas.
    World journal of gastroenterology : WJG. 12/2014; 20(46):17568-77.
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    ABSTRACT: OBJECTIVES:The sessile serrated adenoma/polyp (SSA/P) is increasingly recognized as an important precursor to colorectal cancer (CRC) and may contribute to proximal postcolonoscopy CRCs. Hyperplastic polyps (HPs) generally follow a more benign course than do SSA/Ps, but they have a similar histologic appearance. Our aims were to identify patient and polyp factors associated with reclassification of HPs as SSA/Ps during a central pathology review and to characterize and compare their subsequent clinical management with other polyps.METHODS:From 2003 to 2008, we prospectively enrolled asymptomatic persons aged 50-74 years in a study of screening colonoscopy. Because criteria for SSA/P diagnosis evolved over our study period, we initiated a second review of all HPs >5 mm in size in 2011, with reclassification of polyps if indicated. Rates of subsequent colonoscopies, polypectomies, and CRCs were identified.RESULTS:We enrolled 2,527 persons who underwent colonoscopy in whom 111 had HPs >5 mm. Thirty-two of the 111 participants (28.8%) with HPs >5 mm had their polyps reclassified as SSA/Ps. There were no significant differences in patient characteristics between those with reclassified SSA/Ps and those who had HPs >5 mm. SSA/Ps were more likely to be proximal (P<0.001) and larger (P<0.007) than the HPs. In all, 48.3% of those with high-risk adenomas received appropriate follow-up compared with 26.1% of those with high-risk SSA/Ps.CONCLUSIONS:Almost 1/3 of recently diagnosed HPs >5 mm were reclassified as SSA/Ps. Patients previously diagnosed with larger HPs in the proximal colon may benefit from a pathologic review to ensure appropriate diagnosis and follow-up.Am J Gastroenterol advance online publication, 8 July 2014; doi:10.1038/ajg.2014.78.
    The American journal of gastroenterology. 07/2014;
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    ABSTRACT: To perform a systematic review of utility weights for colorectal cancer (CRC) health states reported in the scientific literature and to determine the effects of disease factors, patient characteristics, and utility methods on utility values.
    Medical decision making : an international journal of the Society for Medical Decision Making. 06/2014;
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    ABSTRACT: Estimating risk for advanced proximal neoplasia (APN) based on distal colon findings can help identify asymptomatic persons who should undergo examination of the proximal colon after flexible sigmoidoscopy (FS) screening. We aimed to determine the risk of APN by most advanced distal finding among an average-risk screening population. Prospective, cross-sectional study. Teaching hospital and colorectal cancer screening center. A total of 4651 asymptomatic persons at average risk for colorectal cancer aged 50 to 74 years (54.4% women [n = 2529] with a mean [± standard deviation] age of 58.4 ± 6.2 years). All participants underwent a complete colonoscopy, including endoscopic removal of all polyps. We explored associations between several risk factors and APN. Logistic regression was used to identify independent predictors of APN. A total of 142 persons (3.1%) had APN, of whom 85 (1.8%) had isolated APN (with no distal findings). APN was associated with older age, a BMI >27 kg/m(2), smoking, distal advanced adenoma and/or cancer, and distal non-advanced tubular adenoma. Those with a distal advanced neoplasm were more than twice as likely to have APN compared with those without distal lesions. Distal findings used to estimate risk of APN were derived from colonoscopy rather than FS itself. In persons at average risk for colorectal cancer, the prevalence of isolated APN was low (1.8%). Use of distal findings to predict APN may not be the most effective strategy. However, incorporating factors such as age (>65 years), sex, BMI (>27 kg/m(2)), and smoking status, in addition to distal findings, should be considered for tailoring colonoscopy recommendations. Further evaluation of risk stratification approaches in other asymptomatic screening populations is warranted.
    Gastrointestinal endoscopy 03/2014; · 6.71 Impact Factor
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    Gastroenterology 05/2013; · 12.82 Impact Factor
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    ABSTRACT: BACKGROUND: Some studies have shown that endoscopist specialty is associated with colorectal cancers missed by colonoscopy. We sought to examine the relationship between endoscopist specialty and polypectomy rate, a colonoscopy quality indicator. Polypectomy rate is defined as the proportion of colonoscopies that result in the removal of one or more polyps. METHODS: A cross-sectional study was conducted of endoscopists and their patients from 7 Montreal and 2 Calgary endoscopy clinics. Eligible patients were aged 50--75 and covered by provincial health insurance. A patient questionnaire assessed family history of colorectal cancer, history of large bowel conditions and symptoms, and previous colonoscopy. The outcome, polypectomy status, was obtained from provincial health administrative databases. For each city, Bayesian hierarchical logistic regression was used to estimate the odds ratio for polypectomy comparing surgeons to gastroenterologists. Model covariates included patient age, sex, family history of colorectal cancer, colonoscopy indication, and previous colonoscopy. RESULTS: In total, 2,113 and 538 colonoscopies were included from Montreal and Calgary, respectively. Colonoscopies were performed by 38 gastroenterologists and 6 surgeons in Montreal, and by 31 gastroenterologists and 5 surgeons in Calgary. The adjusted odds ratios comparing surgeons to gastroenterologists were 0.48 (95% CI: 0.32--0.71) in Montreal and 0.73 (95% CI: 0.43--1.21) in Calgary. CONCLUSIONS: An association between endoscopist specialty and polypectomy was observed in both cities after adjusting for patient-level covariates. Results from Montreal suggest that surgeons are half as likely as gastroenterologists to remove polyps, while those from Calgary were associated with a wide, non-significant Bayesian credible interval. However, residual confounding from patient-level variables is possible, and further investigation is required.
    BMC Gastroenterology 05/2013; 13(1):78. · 2.11 Impact Factor
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    ABSTRACT: BACKGROUND: Algorithms to identify screening colonoscopies in administrative databases would be useful for monitoring CRC screening uptake, tracking health resource utilization, and quality assurance. Previously developed algorithms based on expert opinion were insufficiently accurate. The purpose of this study was to develop and evaluate the accuracy of model-based algorithms to identify screening colonoscopies in health administrative databases. METHODS: Patients aged 50-75 were recruited from endoscopy units in Montreal, Quebec, and Calgary, Alberta. Physician billing records and hospitalization data were obtained for each patient from the provincial administrative health databases. Indication for colonoscopy was derived using Bayesian latent class analysis informed by endoscopist and patient questionnaire responses. Two modeling methods were used to fit the data, multivariate logistic regression and recursive partitioning. The accuracies of these models were assessed. RESULTS: 689 patients from Montreal and 541 from Calgary participated (January to March 2007). The latent class model identified 554 screening exams. Multivariate logistic regression predictions yielded an area under the curve of 0.786. Recursive partitioning using the latent outcome had sensitivity and specificity of 84.5% (95% CI: 81.5-87.5) and 63.3% (95% CI: 59.7-67.0), respectively. CONCLUSIONS: Model-based algorithms using administrative data failed to identify screening colonoscopies with sufficient accuracy. Nevertheless, the approach of constructing a latent reference standard against which model-based algorithms were evaluated may be useful for validating administrative data in other contexts where there lacks a gold standard.
    BMC Medical Informatics and Decision Making 04/2013; 13(1):45. · 1.60 Impact Factor
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    ABSTRACT: Differences between American (United States [US]) and European guidelines for colonoscopy surveillance may create confusion for the practicing clinician. Under- or overutilization of surveillance colonoscopy can impact patient care. The Canadian Association of Gastroenterology (CAG) convened a working group (CAG-WG) to review available guidelines and provide unified guidance to Canadian clinicians regarding appropriate follow-up for colorectal cancer (CRC) surveillance after index colonoscopy. A literature search was conducted for relevant data that postdated the published guidelines. The CAG-WG chose the 2012 US Multi-Society Task Force (MSTF) on Colorectal Cancer to serve as the basis for the Canadian position, primarily because the US approach was the simplest and comprehensively addressed the issue of serrated polyps. Aspects of other guidelines were incorporated where relevant. The CAG-WG recommendations differed from the US MSTF guidelines in three main areas: patients with negative index colonoscopy should be followed-up at 10 years using any of the appropriate screening tests, including colonoscopy, for average-risk individuals; among patients with >10 adenomas, a one-year interval for subsequent colonoscopy is recommended; and for long-term follow-up, patients with low-risk adenomas on both the index and first follow-up procedures can undergo second follow-up colonoscopy at an interval of five to 10 years. The CAG-WG adapted the US MSTF guidelines for colonoscopy surveillance to the Canadian health care environment with a few modifications. It is anticipated that the present article will provide unified guidance that will enhance physician acceptance and encourage appropriate utilization of recommended surveillance intervals.
    Canadian journal of gastroenterology = Journal canadien de gastroenterologie 04/2013; 27(4):224-8. · 1.53 Impact Factor
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    ABSTRACT: Comfort during colonoscopy is a critical component of safety and quality. To develop and validate the Nurse-Assessed Patient Comfort Score (NAPCOMS). Prospective scale validation. Colorectal cancer screening centers in the United Kingdom and Canada. A total of 300 consecutive patients undergoing colonoscopy at participating colorectal cancer screening centers. The NAPCOMS was developed by using a modified Delphi process. During colonoscopy, two endoscopy room nurses independently observed and rated patient comfort and tolerability by using NAPCOMS. In addition, endoscopists reported global comfort scores and patients' reported global comfort by using visual 4-point Likert and National Health Service-United Kingdom Global Rating Scales. Reliability and validity of NAPCOMS was measured by using intraclass correlations (ICC) between nurse ratings of colonoscopies and between NAPCOMS, endoscopist ratings, and patient ratings of global comfort. The ICC for the overall NAPCOMS was 0.84 (95% confidence interval [CI], 0.80-0.87). There was high agreement between the NAPCOMS and endoscopist ratings of comfort (ICC = 0.77; 95% CI, 0.72-0.81), moderate agreement between the NAPCOMS and patient ratings (ICC = 0.61; 95% CI, 0.53-0.67), and moderate agreement between the endoscopist and patient ratings (ICC = 0.52; 95% CI, 0.43-0.60). NAPCOMS was validated in outpatients who received colonoscopy with minimal to moderate sedation as part of a screening and surveillance program, so performance among inpatients or those requiring deep sedation was not tested. NAPCOMS is a reliable and valid tool for assessing patient comfort in the setting of outpatient colonoscopy performed with minimal to moderate sedation.
    Gastrointestinal endoscopy 02/2013; 77(2):255-61. · 6.71 Impact Factor
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    ABSTRACT: Current quality improvement tools for endoscopy services, such as the Global Rating Scale (GRS), emphasize the need for patient-centred care. However, there are no studies that have investigated patient expectations and⁄or perceptions of quality indicators in endoscopy services. To identify quality indicators for colonoscopy services from the patient perspective; to rate indicators of importance; to determine factors that influence indicator ratings; and to compare the identified indicators with those of the GRS. A two-phase mixed methods study was undertaken in Montreal (Quebec), Calgary (Alberta) and Hamilton (Ontario) among patients ≥18 years of age who spoke and read English or French. In phase 1, focus group participants identified quality indicators that were then used to construct a survey questionnaire. In phase 2, survey questionnaires, which were completed immediately after colonoscopy, prompted respondents to rate the 20 focus group-derived indicators according to their level of importance (low, medium, high) and to list up to nine additional items. Multiple logistic regression analysis was used to determine the factors that influenced focus group-derived indicator ratings. Patient-identified indicators were compared with those used in the GRS to identify novel indicators. Three quality indicator themes were identified by 66 participants in 12 focus groups: communication, comfort and service environment. Of the 828 surveys distributed, 402 (48.6%) were returned and 65% of focus group-derived indicators were rated highly important by at least 55% of survey respondents. Indicator ratings differed according to age, sex, site and perceived colorectal cancer risk. Of the 29 patient-identified indicators, 17 (58.6%) were novel. Patients identified 17 novel quality indicators, suggesting that patients and health professionals differ in their perspectives with respect to quality in colonoscopy services.
    Canadian journal of gastroenterology = Journal canadien de gastroenterologie 01/2013; 27(1):25-32. · 1.53 Impact Factor
  • Catherine Dubé, Robert J Hilsden
    Canadian journal of gastroenterology = Journal canadien de gastroenterologie 12/2012; 26(12):869. · 1.53 Impact Factor
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    ABSTRACT: Previously developed screening colonoscopy algorithms based on diagnostic and endoscopy procedural variables have not been sufficiently accurate for use in epidemiological and health services research. To increase understanding of the administrative health database variables that could help to discern screening and nonscreening colonoscopy. A qualitative study using physician focus groups was conducted in Montreal (Quebec), Calgary (Alberta) and Toronto (Ontario). Specialty-specific focus group sessions were held among family physicians and gastroenterologists - the physicians responsible for referring patients to and performing screening colonoscopy, respectively. Interview guides were developed to better understand physician clinical and billing practices. Discussions were audiotaped, transcribed verbatim and analyzed using the constant comparative approach. Forty family physicians and seven gastroenterologists participated in five focus group sessions. Patient variables included demographics (age) and medical history (colorectal cancer risk factors⁄symptoms, medication for colorectal cancer risk factors⁄symptoms, gastrointestinal disorders, severe disease). Clinical practice variables included timing of the colonoscopy (evenings, weekends, holidays, during hospitalization; same-day endoscopist consultation and colonoscopy), use of services (hospitalization, annual examination, transfer from other facility) and procedure use patterns (large bowel or other medical⁄surgical procedure before and subsequent to colonoscopy). However, wide variability in clinical and billing practices will likely preclude the development of a reasonably accurate screening colonoscopy algorithm. Physicians suggested adding a screening colonoscopy code to the administrative health data. Failure to acknowledge the limitations of the provincial administrative health databases to identify screening colonoscopy may lead to incorrect conclusions and the establishment of inappropriate health care policies.
    Canadian journal of gastroenterology = Journal canadien de gastroenterologie 12/2012; 26(12):889-93. · 1.53 Impact Factor
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    ABSTRACT: BACKGROUND: Validation of administrative data is important to assess potential sources of bias in outcome evaluation and to prevent dissemination of misleading or inaccurate information. The purpose of the study was to determine the completeness and accuracy of endoscopy data in several administrative data sources in the year prior to colorectal cancer diagnosis as part of a larger project focused on evaluating the quality of pre-diagnostic care. Methods: Primary and secondary data sources for endoscopy were collected from the Alberta Cancer Registry, cancer medical charts and three different administrative data sources. 1672 randomly sampled patients diagnosed with invasive colorectal cancer in years 2000-2005 in Alberta, Canada were included. A retrospective validation study of administrative data for endoscopy in the year prior to colorectal cancer diagnosis was conducted. A gold standard dataset was created by combining all the datasets. Number and percent identified, agreement and percent unique to a given data source were calculated and compared across each dataset and to the gold standard with respect to identifying all patients who underwent endoscopy and all endoscopies received by those patients. Results: The combined administrative data and physician billing data identified as high or higher percentage of patients who had one or more endoscopy (84% and 78%, respectively) and total endoscopy procedures (89% and 81%, respectively) than the chart review (78% for both). Conclusions: Endoscopy data has a high level of completeness and accuracy in physician billing data alone. Combined with hospital in/outpatient data it is more complete than chart review alone.
    BMC Health Services Research 10/2012; 12(1):358. · 1.77 Impact Factor
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    ABSTRACT: A population-based database of inflammatory bowel disease (IBD) patients is invaluable to explore and monitor the epidemiology and outcome of the disease. In this context, an accurate and validated population-based case definition for IBD becomes critical for researchers and health care providers. IBD and non-IBD individuals were identified through an endoscopy database in a western Canadian health region (Calgary Health Region, Calgary, Alberta). Subsequently, using a novel algorithm, a series of case definitions were developed to capture IBD cases in the administrative databases. In the second stage of the study, the criteria were validated in the Capital Health Region (Edmonton, Alberta). A total of 150 IBD case definitions were developed using 1399 IBD patients and 15,439 controls in the development phase. In the validation phase, 318,382 endoscopic procedures were searched and 5201 IBD patients were identified. After consideration of sensitivity, specificity and temporal stability of each validated case definition, a diagnosis of IBD was assigned to individuals who experienced at least two hospitalizations or had four physician claims, or two medical contacts in the Ambulatory Care Classification System database with an IBD diagnostic code within a two-year period (specificity 99.8%; sensitivity 83.4%; positive predictive value 97.4%; negative predictive value 98.5%). An alternative case definition was developed for regions without access to the Ambulatory Care Classification System database. A novel scoring system was developed that detected Crohn disease and ulcerative colitis patients with a specificity of >99% and a sensitivity of 99.1% and 86.3%, respectively. Through a robust methodology, a reproducible set of criteria to capture IBD patients through administrative databases was developed. The methodology may be used to develop similar administrative definitions for chronic diseases.
    Canadian journal of gastroenterology = Journal canadien de gastroenterologie 10/2012; 26(10):711-7. · 1.53 Impact Factor
  • 01/2012;
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    Robert Jay Hilsden
    Canadian journal of gastroenterology = Journal canadien de gastroenterologie 12/2011; 25(12):655-6. · 1.53 Impact Factor
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    ABSTRACT: Given the limited state of health care resources, increased demand for colorectal cancer (CRC) screening raises concerns about the quality of endoscopy services. Little is known about quality in colonoscopy and endoscopy from the patient perspective. To systematically review the literature on quality that is relevant to patients who require colonoscopy or endoscopy services. A systematic PubMed search was performed on articles that were published between January 2000 and February 2011. Keywords included "colonoscopy" or "sigmoidoscopy'' or "endoscopy" AND "quality"; "colonoscopy" or "sigmoidoscopy" or "endoscopy" AND "patient satisfaction" or "willingness to return". The included articles were qualitative and quantitative English language studies regarding aspects of colonoscopy and⁄or endoscopy services that were evaluated by patients in which data were collected within one year of the colonoscopy⁄endoscopy procedure. In total, 28 quantitative studies were identified, of which eight (28.6%) met the inclusion criteria (four cross-sectional, three prospective cohort and one single-blinded controlled study). Aspects of quality included comfort, management of pain and anxiety, endoscopy unit staff manner, skills and specialty, procedure and results discussion with the doctor, physical environment, wait times for the appointment and procedure, and discharge. Qualitative studies eliciting the patient perspective on what constituted quality in colonoscopy⁄endoscopy were not found. Factors related to comfort, staff, communication and the service environment were evaluated from the patient perspective using closed-ended questions that were designed by clinicians and researchers. Future research using qualitative methodology to elicit the patient perspective on quality in colonoscopy and⁄or endoscopy services is needed.
    Canadian journal of gastroenterology = Journal canadien de gastroenterologie 12/2011; 25(12):681-5. · 1.53 Impact Factor
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    ABSTRACT: Quality assurance (QA) is a process that includes the systematic evaluation of a service, institution of improvements and ongoing evaluation to ensure that effective changes were made. QA is a fundamental component of any organized colorectal cancer screening program. However, it should play an equally important role in opportunistic screening. Establishing the processes and procedures for a comprehensive QA program can be a daunting proposition for an endoscopy unit. The present article describes the steps taken to establish a QA program at the Forzani & MacPhail Colon Cancer Screening Centre (Calgary, Alberta) - a colorectal cancer screening centre and nonhospital endoscopy unit that is dedicated to providing colorectal cancer screening-related colonoscopies. Lessons drawn from the authors' experience may help others develop their own initiatives. The Global Rating Scale, a quality assessment and improvement tool developed for the gastrointestinal endoscopy services of the United Kingdom's National Health Service, was used as the framework to develop the QA program. QA activities include monitoring the patient experience through surveys, creating endoscopist report cards on colonoscopy performance, tracking and evaluating adverse events and monitoring wait times.
    Canadian journal of gastroenterology = Journal canadien de gastroenterologie 10/2011; 25(10):547-54. · 1.53 Impact Factor
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    ABSTRACT: Little is known about physician perceptions of and practices in using infliximab - a biological agent that was approved in Canada for the treatment of Crohn's disease in 2001, and for ulcerative colitis in 2006. To describe Canadian gastroenterologists' use and perceptions of infliximab in the treatment of refractory inflammatory bowel disease (IBD), and to identify factors that may influence a gastroenterologist's decision to initiate infliximab therapy. A postal questionnaire was distributed to all practicing clinicians captured in the 2007 membership of the Canadian Association of Gastroenterology. Each physician was contacted up to a maximum of three times. Of 466 questionnaires mailed out, responses were received from 336 (72%), with 292 respondents (63%) returning fully completed surveys. For 80% of respondents, IBD patients comprised less than 30% of their clinical practice. Most prescribed infliximab at an initial dose of 5 mg⁄kg (97%), prescribed loading doses at 0, 2 and 6 weeks (88%), premedicated with corticosteroids (74%), administered maintenance infusions at eight-week intervals (89%), co-administered immunosuppressive agents (81%) and continued infliximab 'indefinitely' as long as it was effective and well tolerated (76%). Most gastroenterologists (>70%) identified lack of drug insurance coverage and provincial funding criteria as important barriers to prescribing infliximab. Most Canadian gastroenterologists exhibited similar practice patterns with respect to the use of infliximab for induction and maintenance therapy of IBD. Common barriers to the initiation of infliximab therapy were identified.
    Canadian journal of gastroenterology = Journal canadien de gastroenterologie 10/2011; 25(10):565-9. · 1.53 Impact Factor
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    ABSTRACT: Increasing demand combined with limited capacity has resulted in long wait times for average-risk adults referred for screening colonoscopy for colorectal cancer. Management of patients on these growing wait lists is an emerging clinical issue. To inform the content and design of a mailed targeted invitation for patients to undergo annual fecal occult blood testing (FOBT) while awaiting colonoscopy. Focus groups (FGs) with average-risk patients on a wait list for screening colonoscopy at a high-throughput academic outpatient colonoscopy facility were conducted. During each FG session, feedback regarding a range of materials under consideration for the planned intervention was elicited using a semistructured facilitator guide. The FG sessions were recorded and transcribed verbatim, and analyzed using the constant comparative method to identify key themes. Findings from the three FGs (n=28) suggested that average risk patients on a wait list for screening colonoscopy would be receptive to a targeted intervention recommending they undergo FOBT while waiting. Participants indicated that the invitation to undergo FOBT was an important acknowledgement that they were on an actively managed list, and that a mechanism to ensure that they were correctly triaged while waiting was in place. Several specific suggestions to improve the design of the targeted intervention were obtained. Results of the present study provide useful information for developing effective strategies to manage average-risk individuals facing long wait times for screening colonoscopy.
    Canadian journal of gastroenterology = Journal canadien de gastroenterologie 05/2011; 25(5):248-52. · 1.53 Impact Factor

Publication Stats

1k Citations
532.28 Total Impact Points


  • 1996–2014
    • The University of Calgary
      • • Faculty of Medicine
      • • Department of Community Health Sciences
      • • Department of Medicine
      Calgary, Alberta, Canada
  • 2011
    • Sunnybrook Health Sciences Centre
      Toronto, Ontario, Canada
    • University of Saskatchewan
      • Department of Community Health and Epidemiology
      Saskatoon, Saskatchewan, Canada
  • 2007
    • McMaster University
      • Division of Pediatric Gastroenterology
      Hamilton, Ontario, Canada
    • Aga Khan University Hospital, Karachi
      Kurrachee, Sindh, Pakistan
  • 2003
    • Universität Regensburg
      • Lehrstuhl für Innere Medizin I
      Regensburg, Bavaria, Germany