Michelle L DeOliveira

University of Zurich, Zürich, Zurich, Switzerland

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Publications (20)168.09 Total impact

  • Patryk Kambakamba, Michelle L. DeOliveira
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    ABSTRACT: Cholangiocarcinoma is a lethal disease with increasing incidence worldwide. Perihilar cholangiocarcinoma represents the most common type of cholangiocarcinoma. Despite major development on surgical strategies over the past 20 years, the 5-year survival rate after surgery has remained below 40%, often in the vicinity of 20%. Most perihilar cholangiocarcinomas, however, are unresectable at the time of the diagnosis. The recent use of aggressive approaches based on better image modality, specific perioperative management, and a multidisciplinary approach have enabled to convert the use of palliative therapies to more radical surgery. This review focuses on the recent advances in surgical treatment for perihilar cholangiocarcinoma including liver transplantation with their respective impact of on patient survival.
    The American Journal of Surgery 10/2014; · 2.52 Impact Factor
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    ABSTRACT: Liver transplantation (LT) is a highly successful treatment for many non-malignant and malignant liver diseases. However, there is a worldwide shortage of available organs; many patients deteriorate or die on waiting lists. We review the important clinical challenges to LT and the best use for the scarce organs. We focus on changes in indications for LT and discuss scoring systems to best match donors with recipients and optimize outcomes, particularly for the sickest patients. We also cover controversial guidelines for the use of LT for hepatocellular and cholangio-carcinoma. Strategies to increase the number of functional donor organs involve techniques to perfuse the organs before implantation. Partial LT (living donor and split liver transplantation) techniques might help to overcome organ shortage; we discuss small- for-size syndrome. Many new developments could increase the successes of this procedure, already one of the major achievements in medicine during second part of the 20th century.
    Gastroenterology 09/2014; · 12.82 Impact Factor
  • Michelle L Deoliveira
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    ABSTRACT: Cholangiocarcinoma is a rare tumour with dismal prognosis. Only radical resection offers a chance for cure with reported survivals ranging from 25 to 45% at 5 years. Considering the low rate of resectability and lack of efficacy of other treatments, liver transplantation has emerged as a reasonable approach to cure selective patients with unresectable diseases. The use of liver transplantation, however, is associated with the inherent risk of early tumour recurrence due to the need for immunosuppression and the poor survival rate. This review will focus on the role of liver transplantation in treating patients with cholangiocellular cancer. The indication of liver transplantation for cholangiocarcinoma has evolved over time moving from an absolute to a relative contraindication until eventually becoming the best indication for a small group of patients presenting with unresectable perihilar cholangiocarcinoma, when associated with a neoadjuvant chemoradiotherapy. In contrast, the indication of liver transplantation for intrahepatic cholangiocarcinoma is far from being established and should be offered only under protocol, mainly for small tumours in the setting of cirrhosis. The poor outcome of cholangiocarcinoma, irrespective of the therapy, justifies the search for novel approaches. Only selective patients with perihilar cholangiocarcinoma subjected to a neoadjuvant protocol may qualify for liver transplantation.
    Current opinion in organ transplantation 06/2014; 19(3):245-52. · 3.27 Impact Factor
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    ABSTRACT: Lymph node staging is one of the most important factors in determining the prognosis after resection of pancreatic ductal adenocarcinoma. Despite ongoing efforts to further refine lymph node staging, the debate on the extent of lymphadenectomy during pancreaticoduodenectomy is still open. The purpose of this review was to summarize the evidence about performing standard lymphadenectomy during curative resection of pancreatic cancer. All four prospective randomized controlled trials published concluded that extended lymphadenectomy does not contribute to better oncologic outcome for patients with adenocarcinoma of the pancreatic head. Indeed, one major drawback of extended lymphadenectomy is the higher risk of persistent postoperative diarrhea. No prospective randomized studies could be found on the role of extended lymphadenectomy in patients with adenocarcinoma of the corpus and tail. Based on current evidence there is no indication that extended lymphadenectomy should be performed routinely during resection of pancreatic cancer.
    World Journal of Surgery 05/2013; · 2.23 Impact Factor
  • Michelle L Deoliveira, Patryk Kambakamba, Pierre-Alain Clavien
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    ABSTRACT: The purpose of this review is to evaluate the most current strategies of surgical treatment for cholangiocarcinoma including liver resection and transplantation. More aggressive surgical approaches have emerged over the past decade to treat patients previously considered to have unresectable lesions, which include combined hepatectomy with vascular resection, liver mass manipulation, oncological nontouch technique and liver transplantation. Cholangiocarcinoma can occur anywhere along the biliary system. Its detection rate, and consequently its incidence, has risen possibly because of improvements in diagnostic imaging. Cholangiocarcinomas are presently understood within three distinct categories: intrahepatic, perihilar and distal tumors. The perihilar type is the most common, followed by the distal and intrahepatic types. This division has therapeutic relevance because the type of surgery depends on the anatomical location and extension of the tumor. This review will primarily focus on those circumstances in which a hepatectomy is required, which provides the greatest chance of cure. In this setting, liver transplantation for perihilar cholangiocarcinoma has resurged as an excellent option for a selective group of patients, when associated with a neoadjuvant chemoradiation protocol. Despite more aggressive surgical approaches, many cases remain unresectable with a poor prognosis.
    Current opinion in gastroenterology 05/2013; 29(3):293-8. · 4.33 Impact Factor
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    ABSTRACT: PURPOSE: Serotonin is a well-known neurotransmitter and vasoactive substance. Recent research indicates that serotonin contributes to liver regeneration and promotes tumor growth of human hepatocellular cancer. The aim of this study is to investigate the expression of serotonin receptors in hepatocellular cancer and analyze their potential as a cytotoxic target.EXPERIMENTAL DESIGN: Using a tissue microarray and immunohistochemistry, we analyzed the expression of serotonin receptors in the liver from 176 patients with hepatocellular carcinoma, of which nontumor tissue was available in 109 patients. Relevant clinicopathologic parameters were compared with serotonin receptor expression. Two human hepatocellular cancer cell lines, Huh7 and HepG2, were used to test serotonin antagonists as a possible cytotoxic drug.RESULTS: The serotonin receptors 1B and 2B were expressed, respectively, in 32% and 35% of the patients with hepatocellular cancer. Both receptors were associated with an increased proliferation index, and receptor 1B correlated with the size of the tumor. Serotonin antagonists of receptors 1B and 2B consistently decreased viability and proliferation in Huh7 and HepG2 cell lines.CONCLUSION: We identified two serotonin receptors that are often overexpressed in human hepatocellular cancer and may serve as a new cytotoxic target. Clin Cancer Res; 18(21); 1-9. ©2012 AACR.
    Clinical Cancer Research 10/2012; · 7.84 Impact Factor
  • M L DeOliveira, P-A Clavien
    British Journal of Surgery 05/2012; 99(7):885-6. · 4.84 Impact Factor
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    ABSTRACT: To assess the incidence and impact of biliary complications in recipients transplanted from donors after cardiac death (DCD) at one single large institution. Shortage of available cadaveric organs is a significant limiting factor in liver transplantation (LT). The use of DCD offers the potential to increase the organ pool. However, early results with DCD liver grafts were associated with a greater incidence of ischemic cholangiopathy (IC), leading to several programs to abandoning this source of organs. A retrospective analysis of a prospective database from April 2001 to 2010 focused on 167 consecutive DCD-LT. Each DCD transplant was matched with 2 brain death donors (DBD) grafts (n = 333) according to the period of transplantation. Primary outcome measures were biliary complications including the severity of complications, graft survival and patient survival. Minimum follow-up was 3 months. Anastomotic stricture was the most common biliary complication (DCD = 30, 19% vs. DBD = 41, 13%). Most were treated endocoscopically (grade IIIa = 72%), whereas hepatico-jejunostomy (grade IIIb) was performed in 22%. Primary IC occurred in 4 (2.5%) recipients from the DCD group and was absent in the DBD group (P = 0.005). However, none of these patients required retransplantation. Patient and graft survival at 1, 3, and 5 years were similar between DCD and DBD groups (P = 0.106, P = 0.138, P = 0.113, respectively). The encouraging results with DCD-LT are probably due to the selection of DCD grafts and clear definition of warm ischemia.
    Annals of surgery 11/2011; 254(5):716-22; discussion 722-3. · 7.90 Impact Factor
  • Stefan Breitenstein, Michelle L Deoliveira, Pierre A Clavien
    Annals of surgery 11/2011; 254(5):832. · 7.90 Impact Factor
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    ABSTRACT: Perihilar cholangiocarcinoma is one of the most challenging diseases with poor overall survival. The major problem for anyone trying to convincingly compare studies among centers or over time is the lack of a reliable staging system. The most commonly used system is the Bismuth-Corlette classification of bile duct involvement, which, however, does not include crucial information such as vascular encasement and distant metastases. Other systems are rarely used because they do not provide several key pieces of information guiding therapy. Therefore, we have designed a new system reporting the size of the tumor, the extent of the disease in the biliary system, the involvement of the hepatic artery and portal vein, the involvement of lymph nodes, distant metastases, and the volume of the putative remnant liver after resection. The aim of this system is the standardization of the reporting of perihilar cholangiocarcinoma so that relevant information regarding resectability, indications for liver transplantation, and prognosis can be provided. With this tool, we have created a new registry enabling every center to prospectively enter data on their patients with hilar cholangiocarcinoma (www.cholangioca.org). The availability of such standardized and multicenter data will enable us to identify the critical criteria guiding therapy.
    Hepatology 04/2011; 53(4):1363-71. · 12.00 Impact Factor
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    ABSTRACT: New chemotherapy regimens are increasingly used in metastatic colorectal cancer to the liver before surgery. Some clinical observations have suggested that chemotherapy may affect liver regeneration. The aim of this study was to evaluate liver damage and liver regeneration after chemotherapy treatment in a model of partial hepatectomy. C57BL/6 mice were repeatedly treated with intraperitoneal injections of either saline or different chemotherapy regimens including the drugs 5-fluorouracyl (5-FU), irinotecan, oxaliplatin, gemcitabine and combined treatments with 5-FU/irinotecan, 5-FU/oxaliplatin. A 70% partial hepatectomy was performed 1 week after the last injection. Ki-67 and PCNA immunohistochemistry were performed to assess liver regeneration, serum liver enzymes and histology analysis to evaluate injury. A variety of chemotherapeutic agents used at maximum tolerated doses compatible with survival affected body weight and blood cell levels. However, these regimens did not affect liver injury before and after hepatectomy nor did they impair liver regeneration. Liver histology showed no steatosis, fibrosis or inflammation before hepatectomy. We therefore tested whether chemotherapy in presence of diet-induced steatosis may trigger injury. Even under these conditions, we did not observe histological signs of inflammation or sinusoidal injury. Liver injury and liver regeneration are not impaired after neoadjuvant chemotherapy with 5-FU, irinotecan, oxaliplatin and gemcitabine in non-tumoural liver parenchyma. In addition, combined treatments disclose no adverse effects on liver regeneration. Chemotherapy alone induces no histological alterations even in the presence of steatosis.
    Liver international: official journal of the International Association for the Study of the Liver 03/2011; 31(3):313-21. · 3.87 Impact Factor
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    ABSTRACT: To evaluate the effects of pentoxifylline (PTX) on liver regeneration in patients undergoing major liver resection. Recent experimental data suggest that PTX, a tumor necrosis factor (TNF) α inhibitor, enhances liver regeneration and reduces ischemic injury through activation of the interleukin-6 (IL-6) signaling pathway. However, the clinical impact of PTX in patients undergoing major liver surgery is unknown. One hundred one consecutive noncirrhotic patients undergoing major liver surgery with inflow occlusion were included in a double-blinded, randomized, controlled trial (RCT) at a single tertiary care center (2006-2009). Fifty-one patients received intravenous administration of PTX starting 12 hours before and ending 72 hours after surgery, whereas 50 control patients received a placebo infusion. Primary endpoint was liver regeneration as assessed by three-dimensional volumetry based on magnetic resonance (MR) tomography at postoperative day 8 compared with preoperative images. Secondary endpoints were transaminases, cytokines, and postoperative complications. Both groups were comparable regarding demographics, risk score, preoperative laboratory tests, and type and extent of liver resection. Treatment with PTX resulted in significantly better volume regeneration for small remnant livers [remnant liver to body weight (RLBW) ratio ≤ 1.2%], whereas no beneficial effect was observed for RLBW ratio of more than 1.2%. There was a 3.6-fold stronger induction of IL-6 mRNA for the PTX group (P < 0.001). Postoperative alanine aminotransferase (AST) levels were significantly decreased for the PTX group on the second postoperative day (442 vs 585 U/L, P = 0.025). No significant benefit could be identified regarding the number and severity of postoperative complications and median ICU (1 vs 1 day) and hospital stay (10 vs 10 days). However, the PTX group had significantly more drug-related adverse events (23 vs 8, P = 0.007). This is the first RCT evaluating the effects of PTX on liver regeneration after major liver resection. The study demonstrates beneficial effects of PTX on regeneration of small remnant livers (RLBW ratio ≤ 1.2%) that seems to be mediated by IL-6.
    Annals of surgery 11/2010; 252(5):813-22. · 7.90 Impact Factor
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    ABSTRACT: To develop and validate a simple score to predict postoperative complications by severity after liver resection, using readily available preoperative risk factors. Although liver surgery has enjoyed major development with dramatic reduction in mortality rates, the incidence of serious yet nonlethal complications remains high. No scoring system is currently available to identify those patients at higher risk for a complicated course. Complications were prospectively assessed in 615 consecutive noncirrhotic patients undergoing liver resection at the same institution. In randomly selected 60% of the population, multivariate-logistic-regression analysis was used to develop a score to predict severe complications defined as complications grades III, IV, and mortality (grade V) (Clavien-Dindo classification). The score was validated by calibration within the remaining 40% of the patients. Grades III to V complications occurred in 159 (26%) of the 615 patients after liver resection, 90 (15%) were grade III, 48 (8%) grade IV, and 21 (3%) grade V. Four preoperative parameters were identified as independent predictors including American Society of Anesthesiologists category, transaminases levels (aspartate aminotransferase), extent of liver resection (>3 vs <3 segments), and the need for an additional hepaticojejunostomy or colon resection. A prediction score was calculated on the basis of 60% of the population (369 patients) using the 4 independent predictors ranging from 0 to 10 points. The risk to develop serious postoperative complications was 16% in "low risk" patients (0-2 points), 37% in "intermediate risk" patients (3-5 points) and 60% in "high risk" patients (6-10 points). The predicted mean for absolute risk for grades III to V complications was 27% in the validation population including 40% of the patients (n = 246), whereas the observed risk was 24%. Predicted and observed risks were similar throughout the different risk categories (P = 0.8). The score was significantly associated with hospital and intensive care unit stays. Costs of the entire procedure doubled among the 3 risk groups. This novel and simple score accurately predicts postoperative complications and cost in patients undergoing liver resection. This score allows early identification of patients at risk and may impact not only decision making for surgical intervention but also quality assessment and reimbursement.
    Annals of surgery 11/2010; 252(5):726-34. · 7.90 Impact Factor
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    M L DeOliveira, R Graf, P-A Clavien
    American Journal of Transplantation 04/2008; 8(3):489-91. · 6.19 Impact Factor
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    ABSTRACT: Survival after resection of colorectal liver metastases has traditionally been associated with clinicopathologic factors. We sought to investigate whether echogenicity of colorectal liver metastasis as assessed by intraoperative ultrasound (IOUS) was a prognostic factor after hepatic resection. Prospective data on tumor IOUS appearance were collected in 84 patients who underwent hepatic resection for colorectal liver metastasis. Images were digitally recorded, blindly reviewed, and scored for echogenicity (hypo-, iso-, or hyperechoic). The median tumor number was 1 and the median tumor size was 5.0 cm. At the time of surgery, the IOUS appearance of the colorectal liver metastases were hypoechoic in 35 (41.7%) patients, isoechoic in 37 (44.0%) patients, and hyperechoic in 12 (14.3%) patients. Traditional clinicopathologic prognostic factors were similarly distributed among the three echogenicity groups (all p > 0.05). Patients with a hypoechoic lesion had a significantly shorter median survival (30.2 months) compared with patients who had either an isoechoic (53.2 months) or hyperechoic (42.3 months) lesion (p = 0.005). The 5-year survival after hepatic resection of colorectal liver metastasis was also associated with the echogenic appearance of the lesion (hypoechoic 14.4 vs isoechoic 37.4 vs hyperechoic 46.2%) (p < 0.05). Intraoperative ultrasound echogenicity should be considered a prognostic factor after hepatic resection of metastatic colorectal cancer.
    Journal of Gastrointestinal Surgery 09/2007; 11(8):970-6; discussion 976. · 2.36 Impact Factor
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    New England Journal of Medicine 05/2007; 356(15):1545-59. · 54.42 Impact Factor
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    ABSTRACT: To assess long-term survival and prognostic factors in a large series of patients with bile duct cancer. The incidence of bile duct cancer is low but increasing. Determinants of survival vary in the literature, due to a lack of sufficient numbers of patients in most series. We studied 564 consecutive patients with bile duct cancer operated upon between 1973 and 2004. Patients were divided into intrahepatic, perihilar, and distal groups. Principle outcome measures were complications, 30-day mortality, and survival. Of the 564 patients, 44 (8%) had intrahepatic, 281 (50%) had perihilar, and 239 (42%) had distal tumors. Approximately half (294, 52%) were treated before 1995, while 270 (48%) were treated thereafter. The perioperative mortality rate was 4%. In log-rank analyses, survival was higher in the later time period (P = 0.002), in patients with intrahepatic disease (P = 0.001), with negative resection margins (P < 0.001), with well/moderately differentiated tumors (P < 0.001), and those with negative lymph nodal status (P < 0.001). In multivariate analysis, negative margins (P < 0.001), tumor differentiation (P < 0.001), and negative nodal status (P < 0.001), but not tumor diameter, were significant independent prognostic factors. In R0-resected patients, lymph node status (P < 0.001), but not tumor diameter, histology, or differentiation, further predicted survival. The median survivals for R0-resected intrahepatic, perihilar, and distal tumors were 80, 30, and 25 months, respectively, and the 5-year survivals were 63%, 30%, and 27%, respectively. R0 resection remains the best chance for long-term survival, and lymph node status is the most important prognostic factor following R0 resection.
    Annals of Surgery 05/2007; 245(5):755-62. · 6.33 Impact Factor
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    Katarzyna Furrer, Michelle Lucinda Deoliveira, Rolf Graf, Pierre-Alain Clavien
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    ABSTRACT: Liver surgery is associated with many factors, which may affect outcome. Preoperative assessment of patient's general condition, resectability, and liver reserve are paramount for success. The Child-Pugh score and other scoring systems only partially enables to assess the risk associated with liver surgery. The presence of portal hypertension per se is a major risk factor for hepatectomy. Intraoperatively, any attempts should be made to minimize blood loss. Low central venous pressure and inflow occlusion best prevent bleeding. Ischemic preconditioning and intermittent clamping are routinely applied in many centers to protect against long periods of ischemia, although the mechanisms of protection remain unclear. In this review we describe recent advances in activated pathways associated with protection against ischemia. Postoperatively, the best factor impacting on outcome probably resides in experienced medical care particularly in the intensive care setting. Currently, no drug or gene therapy approaches has reached the clinic. The future relies on new insight into mechanisms of ischemia-reperfusion injury.
    Liver international: official journal of the International Association for the Study of the Liver 03/2007; 27(1):26-39. · 3.87 Impact Factor
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    ABSTRACT: To define a simple and reproducible classification of complications following pancreaticoduodenectomy (PD) based on a therapy-oriented severity grading system. While mortality is rare after PD, morbidity rates remain high. The lack of standardization in evaluating morbidity after PD has severely hampered meaningful comparisons over time and among centers. We adapted a novel classification of complication to stratify morbidity by severity after PD, to test whether the incidence of pancreatic fistula has changed over time, and to identify risk factors in a single North American center. The classification was applied to a consecutive series of 633 patients undergoing PD between February 2003 and August 2005. Another series of 141 patients treated between 1987 and 1990 was also analyzed to identify changes in the incidence and severity of fistula. Univariate and multivariate analyses were performed to link respective complications with preoperative and intraoperative parameters, length of hospital stay, and long-term survival. A total of 263 (41.5%) patients did not develop any complication, while 370 (58.5%) had at least one complication; 62 (10.0%) patients had only grade I complications (no need for specific intervention), 192 patients (30.0%) had grade II (need for drug therapy such as antibiotics), 85 patients (13.5%) had grade III (need for invasive therapy), and 19 patients (3.0%) had grade IV complications (organ dysfunction with ICU stay). Grade V (death) occurred in 12 patients (2.0%). A total of 57 patients (9.0%) developed pancreatic fistula, of which 33 (58.0%) were classified as grade II, 17 (30.0%) as grade III, 5 (9.0%) as grade IV, and 2 (3.5%) as grade V. Delayed gastric emptying was documented in 80 patients (12.7%); half of them were scored as grade II and the other half as grade III. A significant decrease in the incidence of fistula was observed between the 2 periods analyzed (14.0% vs. 9.0%, P < 0.001), mostly due to a decrease in grade II fistula. Cardiovascular disease was a risk factor for overall morbidity and complication severity, while texture of the gland and cardiovascular disease were risk factors for pancreatic fistula. This study demonstrates the applicability and utility of a new classification in grading complications following pancreatic surgery. This novel approach may provide a standardized, objective, and reproducible assessment of pancreas surgery enabling meaningful comparison among centers and over time.
    Annals of Surgery 01/2007; 244(6):931-7; discussion 937-9. · 6.33 Impact Factor
  • Michelle L DeOliveira, Lucas McCormack, Pierre-Alain Clavien
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    ABSTRACT: Purpose of review: Preservation injury in liver grafts remains a central issue in liver transplantation because of the increasing use of marginal donor grafts. Many experimental studies have been performed over the past 2 decades, but very few novel strategies have been applied successfully in patients. Cooling of organs with an appropriate preservation solution remains the most effective approach to prolonged preservation. Recent findings: Two new simple preservation solutions, Celsior and histidine-tryptophan-ketoglutarate, have yielded similar or better results than the University of Wisconsin solution used worldwide since the late 1980s. A significant part of preservation injury, however, occurs either before cold preservation or at the time of rewarming and after reperfusion. Among the many drugs that prevent reperfusion injury in various animal models, caspase inhibitors, pentoxiphylline and antiproteases appear promising, as does over-expression of protective molecules such as heme oxygenase-1 and carbon monoxide. Summary: Despite much effort and testing of appealing novel strategies in the laboratory, only few modifications in the preservation of liver grafts have gained wide acceptance over the past decade. There is an urgent need for large clinical trials testing novel drugs and surgical strategies, such as ischaemic preconditioning or flushing of grafts before reperfusion with various preservation solutions.
    Current Opinion in Organ Transplantation 05/2006; 11(3):213-218. · 3.27 Impact Factor

Publication Stats

785 Citations
168.09 Total Impact Points

Institutions

  • 2008–2014
    • University of Zurich
      • Center for Microscopy and Image Analysis - ZMB
      Zürich, Zurich, Switzerland
  • 2012
    • Universität Regensburg
      Ratisbon, Bavaria, Germany
  • 2007
    • Johns Hopkins University
      • Department of Surgery
      Baltimore, MD, United States