Kwang Jae Lee

Busan Veterans Hospital, Tsau-liang-hai, Busan, South Korea

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Publications (123)263.89 Total impact

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    ABSTRACT: We evaluated the long-term outcome and clinical course of patients of nonsteroidal anti-inflammatory drug (NSAID)-induced small intestinal injury by performing capsule endoscopy (CE). A multicenter retrospective study was conducted using data collected from the CE nationwide database registry, which has been established since 2002. A total of 140 patients (87 males; mean age, 60.6±14.8 years) from the CE nationwide database registry (n=2,885) were diagnosed with NSAID-induced small intestinal injury and enrolled in our study. Fortynine patients (35.0%) presented with a history of aspirin use and an additional 49 (35.0%) were taking NSAIDs without aspirin. The most prominent findings after performing CE were multiple ulcerations (n=82, 58.6%) and erosions or aphthae (n=32, 22.9%). During the follow-up period (mean, 15.9±19.0 months; range, 0 to 106 months), NSAID-induced small intestinal injury only recurred in six patients (4.3%). Older age and hypertension were positive predictive factors for recurrence. These results suggest that the recurrence of NSAID-induced small bowel injury was not frequent in the presence of conservative treatment. Therefore, the initial diagnosis using CE and the medication history are important. (Gut Liver, Published online December 5, 2014).
    Gut and liver. 12/2014;
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    ABSTRACT: Helicobacter pylori eradication therapy has been used as a first-line treatment for H. pylori-positive gastric mucosa-associated lymphoid tissue (MALT) lymphoma. However, the management strategy for H. pylori-negative MALT lymphoma remains controversial. Therefore, the aim of this study was to examine the success rate of each treatment option for H. pylori-positive and H. pylori-negative gastric MALT lymphomas.
    Gut and liver. 07/2014; 8(4):408-14.
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    ABSTRACT: BACKGROUND: Data regarding the prescription status of individuals with diabetes are limited. This study was an analysis of participants from the relationship between cardiovascular disease and brachial-ankle pulse wave velocity in patients with type 2 diabetes (REBOUND) Study, which was a prospective multicenter cohort study recruited from eight general hospitals in Busan, Korea. We performed this study to investigate the current status of prescription in Korean type 2 diabetic patients. METHODS: Type 2 diabetic patients aged 30 years or more were recruited and data were collected for demographics, medical history, medications, blood pressure, and laboratory tests. RESULTS: Three thousands and fifty-eight type 2 diabetic patients were recruited. Mean age, duration of diabetes, and HbA1c were 59 years, 7.6 years, and 7.2%, respectively. Prevalence of hypertension was 66%. Overall, 7.3% of patients were treated with diet and exercise only, 68.2% with oral hypoglycemic agents (OHAs) only, 5.3% with insulin only, and 19.2% with both insulin and OHA. The percentage of patients using antihypertensive, antidyslipidemic, antiplatelet agents was similar as about 60%. The prevalence of statins and aspirin users was 52% and 32%, respectively. CONCLUSION: In our study, two thirds of type 2 diabetic patients were treated with OHA only, and one fifth with insulin plus OHA, and 5% with insulin only. More than half of the patients were using each of antihypertensive, antidyslipidemic, or antiplatelet agents. About a half of the patients were treated with statins and one third were treated with aspirin.
    Diabetes & metabolism journal 06/2014; 38(3):230-239.
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    ABSTRACT: Preoperative localization is the most important preparation for laparoscopic surgery. Preoperative marking with India ink has widely been used and is considered to be safe and effective. However, India ink can cause significant inflammation, adhesions and bowel obstruction. Therefore, we have used the patient's blood instead of the ink since 2011. In this retrospective study, we wanted to examine the feasibility of preoperative localization by using the patient's blood.
    Annals of coloproctology. 06/2014; 30(3):115-7.
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    ABSTRACT: Colonic pseudo-obstruction (CPO) is defined as marked colonic distension in the absence of mechanical obstruction. We aimed to investigate the clinical characteristics of CPO and the factors associated with the response to medical treatment by using a multicenter database in Korea. CPO was diagnosed as colonic dilatation without mechanical obstruction by using radiologic and/or endoscopic examinations. Acute CPO occurring in the postoperative period in surgical patients or as a response to an acute illness was excluded. CPO cases were identified in 15 tertiary referral hospitals between 2000 and 2011. The patients' data were retrospectively reviewed and analyzed. In total, 104 patients (53 men; mean age at diagnosis, 47 yr) were identified. Seventy-seven of 104 patients (74%) showed a transition zone on abdominal computed tomography. Sixty of 104 patients (58%) showed poor responses to medical treatment and underwent surgery at the mean follow-up of 7.4 months (0.5-61 months). Younger age at the time of diagnosis, abdominal distension as a chief complaint, and greater cecal diameter were independently associated with the poor responses to medical treatment. These may be risk factors for a poor response to medical treatment.
    Journal of Korean medical science. 05/2014; 29(5):699-703.
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    ABSTRACT: Owing to the rarity of the disease, epidemiologic information on achalasia is limited. This study aimed to investigate the epidemiology and treatment patterns of achalasia in the population of Korea using a national healthcare database. The diagnostic code K22.0 of the International Classification of Diseases was used to identify cases of achalasia between 2007 and 2011. Treatment modalities for achalasia were identified using the electronic data interchange codes Q7642 or Q7641 for balloon dilation and QA421 or QA422 for esophago-cardiomyotomy. A total of 3,105 patients with achalasia (1,447 men; mean age, 52.5 yr) were identified between 2007 and 2011, indicating a prevalence of 6.29/100,000 (95% confidence interval [CI], 4.94-7.66) during this 5-yr period. A total of 191 incident cases of achalasia (82 men; mean age, 49.5 yr), which were not diagnosed as achalasia in the previous 4 yr, were detected in 2011, indicating an incidence of 0.39/100,000 (95% CI, 0.15-0.63) for that year. During the study period, balloon dilation therapy was performed a total of 975 times in 719 patients, and surgical esophago-cardiomyotomy was performed once per patient in 17 patients. This is the first population-based epidemiologic study of achalasia in Korea.
    Journal of Korean medical science 04/2014; 29(4):576-80. · 0.84 Impact Factor
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    ABSTRACT: Antispasmodics such as octylonium are widely used to manage irritable bowel syndrome (IBS) symptoms. However, the efficacy and safety of another antispasmodic, tiropramide, remain uncertain. We aimed to evaluate the efficacy and safety of tiropramide compared with octylonium in patients with IBS. In this multicenter, randomized, non-inferiority trial, 287 patients with IBS (143 receiving tiropramide and 144 octylonium) were randomly allocated to either tiropramide 100 mg or octylonium 20 mg t.i.d (means 3 times a day) for 4 weeks. Primary endpoint was the mean change of abdominal pain from baseline assessed by visual analogue scales (VAS) score after 4 weeks of treatment. Secondary endpoints were the changes in abdominal pain from baseline at week 2 and in abdominal discomfort at weeks 2 and 4, using VAS scores, patient-reported symptom improvement including stool frequency and consistency, using symptom diaries, IBS-quality of life (IBS-QoL), and depression and anxiety, at week 4. The VAS scores of abdominal pain at week 4, were significantly decreased in both tiropramide and octylonium groups, but the change from baseline did not differ between the 2 groups (difference,-0.26 mm; 95% CI,-4.33-3.82; P = 0.901). Abdominal pain and discomfort assessed using VAS scores, diaries, and IBS-QoL were also improved by both treatments, and the changes from baseline did not differ. The incidence of adverse events was similar in the 2 groups, and no severe adverse events involving either drug were observed. Tiropramide is as effective as octylonium in managing abdominal pain in IBS, with a similar safety profile.
    Journal of neurogastroenterology and motility 01/2014; 20(1):113-21.
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    ABSTRACT: Background and study aims: The clinical impact of video capsule endoscopy (VCE) in patients with obscure gastrointestinal bleeding (OGIB) remains undetermined. The aim of this study was to evaluate the long-term clinical impact of VCE in patients with OGIB using a nationwide registry. Patients and methods: Data from 305 patients who underwent VCE for OGIB from 13 hospitals in Korea between January 2006 and March 2009 were analyzed. Prospectively collected VCE registry data were reviewed, and follow-up data were collected by chart review and telephone interviews with patients. Multivariate regression analyses using hazard ratios (HR) were performed to determine risk factors for rebleeding. Results: Significant findings were detected in 157 patients (51.5 %). After VCE, interventional treatment was performed in 36 patients (11.8 %). The overall rebleeding rate was 19.0 % during a mean (± SD) follow-up of 38.7 ± 26.4 months. Rebleeding rate did not differ by positive VCE results or application of interventional treatment. Multivariate analysis revealed that angiodysplasia (HR 1.82; 95 % confidence interval [CI] 1.04 - 3.20; P = 0.037) and duration of OGIB > 3 months (HR 1.64; 95 %CI 1.10 - 2.46; P = 0.016) were independent prognostic factors associated with rebleeding. In a subgroup analysis of patients taking anticoagulants, patients who discontinued drugs after VCE showed a lower rebleeding rate than those who did not discontinue this therapy (P = 0.019). Conclusions: VCE did not have a significant impact on the long-term outcome of patients with OGIB. Patients with angiodysplasia on VCE or OGIB > 3 months need to be closely followed even after interventional treatment. In patients who are taking anticoagulants, discontinuation of drugs is necessary in order to lower the risk of rebleeding.
    Endoscopy 11/2013; · 5.74 Impact Factor
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    ABSTRACT: Gastrointestinal (GI) lipomas are benign, slow-growing subepithelial tumors. Most lipomas are detected incidentally at endoscopy, but they can cause GI bleeding, abdominal pain, intestinal obstruction, and intussusception, particularly if they are larger than 2 cm in diameter. The aim of this study was to investigate the efficacy, safety, and long-term prognosis of endoscopic treatment of GI lipomas. A total of 28 GI lipomas treated endoscopically from January 2005 to June 2012 were retrospectively reviewed. Endoscopic treatment was performed by four methods: the unroofing technique, endoscopic mucosal resection (EMR), EMR after precutting (EMR-P), and endoscopic submucosal dissection (ESD). Of 28 GI lipomas, 5 were located in the stomach, 2 in the duodenum, and 21 in the colon. Thirteen lipomas were <2 cm in diameter (small lipoma), and the other 15 were ≥2 cm (large lipoma). The unroofing technique was performed in 2 cases, EMR in 17 cases, EMR-P in 4 cases, and ESD in 5 cases. En bloc resection was performed with 21 lesions (75 %), and endoscopic complete resection was achieved with 26 lesions (93 %). Incomplete resection occurred in the 2 cases treated by the unroofing technique. On pathologic examination, complete resection was achieved with 21 lesions (75 %). Delayed bleeding was observed in one patient. There were no serious complications such as perforation or post-procedural stricture. During the mean follow-up period of 19 months (range 2-91 months), no recurrence was observed. Endoscopic treatment appears to be a safe and effective treatment for GI lipomas, including large lipomas (≥2 cm in diameter).
    Surgical Endoscopy 08/2013; · 3.43 Impact Factor
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    ABSTRACT: [This corrects the article on p. 349 in vol. 29.].
    Molecules and Cells 07/2013; 36(1):97. · 2.21 Impact Factor
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    ABSTRACT: Abstract Objective. Asymptomatic erosive esophagitis (EE) is incidentally found during endoscopy for health screening. The authors have aimed to investigate the prevalence of asymptomatic EE in subjects undergoing health checkups and factors associated with symptom presentation of EE. Methods. Among the consecutive 13,342 adults who underwent esophagogastroduodenoscopy in health checkup programs of Ajou University Hospital from May 2010 to April 2011, 8840 subjects (5683 men and 3157 women; median age, 45 years) who met the enrollment criteria were included in the analysis. They completed a questionnaire that evaluated smoking, medication history, anxiety, depression, esophagopharyngeal symptoms, and dyspeptic symptoms. The mucosal damage of the esophagus was assessed using the Los Angeles classification system. Individuals who had EE but no esophagopharyngeal symptoms were classified into the asymptomatic EE group. Results. A total of 768 subjects were diagnosed with gastroesophageal reflux disease based on the occurrence of heartburn and/or acid regurgitation at least once a week. The prevalence of symptomatic and asymptomatic EE in 8840 subjects was 4.3% and 3.3%, respectively. About 43% of individuals with EE did not exhibit any esophagopharyngeal symptoms. Male gender and postprandial distress syndrome were independently associated with asymptomatic EE. Male gender, current smoking, anxiety, epigastric pain syndrome (EPS), and postprandial distress syndrome were independently associated with symptomatic EE. Compared with the asymptomatic EE group, anxiety and EPS were independent factors associated with symptomatic EE. Conclusions. Asymptomatic EE is common in subjects undergoing a health checkup. The coexistence of anxiety or EPS appears to be the predictors for the symptom presentation of EE.
    Scandinavian Journal of Gastroenterology 07/2013; · 2.33 Impact Factor
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    Seon Kyo Im, Mari Yeo, Kwang Jae Lee
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    ABSTRACT: The primary pathophysiologic abnormality in achalasia is known to be a loss of inhibitory myenteric ganglion cells, which may result from an immune-mediated response or neuronal degeneration. The aim of this study was to identify proteins suggestive of an immune-mediated response or neuronal degeneration in the serum of achalasia patients using a proteomic analysis. Blood samples were collected from five symptomatic achalasia patients and five sex- and age-matched healthy controls. Serum proteomic analysis was conducted, and the protein spots were identified using matrix-assisted laser desorption ionization/time-of-flight and a proteomics analyzer. The serum level of C3 was measured by enzyme-linked immunosorbent assay in nine patients with achalasia and 18 sex- and age-matched healthy controls. Of the 658 matched protein spots, 28 spots were up-regulated over 2-fold in the serum from achalasia patients compared with that from controls. The up-regulated proteins included complement C4B5, complement C3, cyclin-dependent kinase 5, transthyretin, and alpha 2 macroglobulin. The serum levels of C3 in achalasia patients were significantly higher than those of controls. The serum proteomic analysis of achalasia patients suggests an immune-mediated response or neuronal degeneration. Further validation studies in larger samples and the esophageal tissue of achalasia patients are required.
    Gut and liver 07/2013; 7(4):411-6. · 1.31 Impact Factor
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    ABSTRACT: Stress is believed to play a role in the pathogenesis of functional gastrointestinal disorders. The aim of the present study was to investigate the effect of acute auditory stress on gastric motor responses to a meal in healthy subjects. A total of 8 healthy volunteers (7 men and 1 woman; median age, 33.4 years [30-35 years]) who had no recurrent gastrointestinal symptoms participated in the prospective, randomized, crossover study. Gastric half-emptying time and meal-induced proximal gastric accommodation were measured using gastric scintigraphy under the auditory stress and control conditions in a randomized cross-over design. The gastric half-emptying time under the stress condition was significantly longer than that under the control condition (130.8 ± 16.6 vs. 105.0 ± 13.1 min; P = 0.005 by paired t test). Under the stress and control conditions, the proximal gastric volume significantly increased after a meal (P < 0.001 by repeated-measures analysis of variance [ANOVA]). The degree of the postprandial increase in proximal gastric volume did not significantly differ between both conditions (P = 0.598 by tests of between-subjects effects using repeated-measures ANOVA). The severity scores of postprandial epigastric discomfort and fullness were significantly higher under the stress condition than under the control condition (P = 0.001 and P = 0.039, respectively, by paired t test). Acute auditory stress delays gastric emptying and increases the severity of postprandial symptoms in the healthy subjects, suggesting the relevance of psychological stress to the pathophysiological mechanism of functional dyspepsia.
    Journal of Gastroenterology and Hepatology 06/2013; · 3.33 Impact Factor
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    ABSTRACT: Hemophagocytic syndrome (HPS) is an uncommon hematological disorder that manifests as fever, splenomegaly, and jaundice, with hemophagocytosis in the bone marrow and other tissues pathologically. Secondary HPS is associated with malignancy and infection, especially viral infection. The prevalence of cytomegalovirus (CMV) infection in ulcerative colitis (UC) patients is approximately 16%. Nevertheless, HPS in UC superinfected by CMV is very rare. A 52-year-old female visited the hospital complaining of abdominal pain and hematochezia for 6 days. She was diagnosed with UC 3 years earlier and had been treated with sulfasalazine, but had stopped her medication 4 months earlier. On admission, her spleen was enlarged. The peripheral blood count revealed pancytopenia and bone marrow aspiration smears showed hemophagocytosis. Viral studies revealed CMV infection. She was treated successfully with ganciclovir. We report this case with a review of the related literature.
    The Korean Journal of Internal Medicine 05/2013; 28(3):352-5.
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    ABSTRACT: In patients with occlusive colorectal cancers, a complete preoperative evaluation of the colon proximal to the obstruction is often impossible. We aimed to evaluate the feasibility of preoperative colonoscopy after stent placement and to determine whether the success rate of colonoscopy differs between covered and uncovered stents. Seventy-three patients with malignant colorectal obstruction were enrolled prospectively. In patients with a resectable cancer, a preoperative colonoscopy was performed after insertion of a self-expandable metal stent (SEMS). The success rate of complete preoperative colonoscopy was compared between covered and uncovered stents. Forty-five of 73 patients who underwent stent placement had a resectable cancer (61.6%). A complete preoperative colonoscopy was possible in 40 of 45 patients (88.9%). The success rate of complete preoperative colonoscopy was significantly lower in the covered-stent group when the obstructing mass lesion was located in the sigmoid colon (p=0.024). Synchronous cancer was detected in one patient (2.2%). Stent migration was observed in four patients with a covered stent. A preoperative complete colonoscopy after SEMS placement was feasible and safe in most patients with malignant colorectal obstruction. Uncovered stents seem to have more advantages than covered stents in preoperative colonoscopy proximal to the obstruction.
    Gut and liver 05/2013; 7(3):311-316. · 1.31 Impact Factor
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    ABSTRACT: BACKGROUNDAIMS: Duodenal immune alterations have been reported in a subset of patients with functional dyspepsia (FD). The aim of this study was to investigate the effect of acute stress on immune cell counts and the expression of tight junction proteins in the duodenal mucosa. Twenty-one male rats were divided into the following three experimental groups: 1) the nonstressed, control group, 2) the 2-hour-stressed group, and 3) the 4-hour-stressed group. Eosinophils, mast cells and CD4(+) and CD8(+) T lymphocytes in the duodenal mucosa were counted. The protein and mRNA expressions of occludin and zonula occludens-1 (ZO-1) were examined. Eosinophils, mast cells and CD8(+) T lymphocyte counts did not differ between the stressed and control groups. The number of CD4(+) T lymphocytes and the protein and mRNA expressions of occludin and ZO-1 were significantly lower in the 4-hour-stressed group compared with the control group. The plasma adrenocorticotrophic hormone and cortisol levels of the 4-hour-stressed group were significantly higher than those of the control group. Acute stress reduces the number of CD4(+) T lymphocytes and the expression of tight junction proteins in the duodenal mucosa, which might be associated with the duodenal immune alterations found in a subset of FD patients.
    Gut and liver 03/2013; 7(2):190-6. · 1.31 Impact Factor
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    Kwang Jae Lee
    Journal of neurogastroenterology and motility 01/2013; 19(1):116-7.
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    ABSTRACT: In 2010, a Korean guideline for the management of gastroesophageal reflux disease (GERD) was made by the Korean Society of Neurogastroenterology and Motility, in which the definition and diagnosis of GERD were not included. The aim of this guideline was to update the clinical approach to the diagnosis and management of GERD in adult patients. This guideline was developed by the adaptation process of the ADAPTE framework. Twelve guidelines were retrieved from initial queries through the Appraisal of Guidelines for Research & Evaluation II process. Twenty-seven statements were made as a draft and revised by modified Delphi method. Finally, 24 consensus statements for the definition (n=4), diagnosis (n=7) and management (n=13) of GERD were developed. Multidisciplinary experts participated in the development of the guideline, and the external review of the guideline was conducted at the finalization phase. (Korean J Gastroenterol 2012;60:195-218).
    The Korean journal of gastroenterology = Taehan Sohwagi Hakhoe chi 10/2012; 60(4):195-218.
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    ABSTRACT: GOALS:: To identify predictive factors associated with the presence of missed synchronous lesions after endoscopic submucosal dissection (ESD) for gastric adenoma or early gastric cancer (EGC). BACKGROUND:: Secondary gastric neoplasms that develop during follow-up period after ESD for gastric adenoma or EGC are divided into metachronous lesions and missed synchronous lesions. METHODS:: ESD was performed in 250 patients with EGC or gastric adenoma. The patients with endoscopic follow-ups of <1 year, patients without curative resection, and patients with additional surgery were excluded from the study. Missed synchronous lesions were defined as secondary gastric neoplasms detected within one year of ESD but initially missed. We compared clinicopathologic factors between patients with missed synchronous lesions and patients without missed synchronous lesions. RESULTS:: Missed synchronous lesions were found in 11.6% of the patients (29/250). The occurrence of missed synchronous lesions had significant correlation with tumor number at the time of ESD and age in the univariate analysis. Tumor number at the time of ESD and age were significant independent predictive factors for presence of missed synchronous lesions by multivariate logistic regression analysis (odds ratio 5.302, P=0.006; odds ratio 2.315, P=0.040, respectively). Missed synchronous lesions tended to be smaller, often located in the same third of the stomach as the main lesions. CONCLUSIONS:: Tumor number at the time of ESD and age could be predictive factors for the presence of missed synchronous lesions after ESD. Careful endoscopic surveillance should be performed after ESD for multiple lesions or for elderly patients.
    Journal of clinical gastroenterology 07/2012; · 2.21 Impact Factor
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    Kwang Jae Lee
    Journal of neurogastroenterology and motility 07/2012; 18(3):350-1.

Publication Stats

638 Citations
263.89 Total Impact Points

Institutions

  • 2014
    • Busan Veterans Hospital
      Tsau-liang-hai, Busan, South Korea
  • 2008–2014
    • Pusan National University
      • Department of Internal Medicine
      Tsau-liang-hai, Busan, South Korea
  • 2004–2014
    • Ajou University
      • • Department of Gastroenterology
      • • School of Medicine
      Sŏul, Seoul, South Korea
  • 2011
    • Seoul Medical Center
      Sŏul, Seoul, South Korea
  • 2006–2011
    • Chonbuk National University
      • • Division of Advanced Materials Engineering
      • • Department of Electronic Engineering
      Tsiuentcheou, North Jeolla, South Korea
  • 2010
    • Wonkwang University School of Medicine and Hospital
      Riri, North Jeolla, South Korea
    • Yeungnam University
      • Division of Internal Medicine
      Onyang, South Chungcheong, South Korea
    • CHA University
      • Department of Biomedical Science
      Seoul, Seoul, South Korea
    • Catholic University of Korea
      • Department of Internal Medicine
      Seoul, Seoul, South Korea
  • 2009
    • Soon Chun Hyang University Hospital
      Sŏul, Seoul, South Korea
  • 2007
    • Universitair Ziekenhuis Leuven
      • Department of Gastroenterology
      Louvain, Flanders, Belgium