Faculty of Medicine, University of Ottawa, Canada. Liver and Pancreas Unit, Department of Surgery, The Ottawa Hospital, University of Ottawa, Canada. Liver and Pancreas Unit, Department of Surgery, The Ottawa Hospital, University of Ottawa, Canada; Clinical Epidemiology Program, Ottawa Hospital Research Institute, Canada. Library Services, The Ottawa Hospital, Canada. Hepatopancreatobiliary and Liver Transplantation Division, Centre hospitalier de l'Universite de Montreal, Canada. Liver and Pancreas Unit, Department of Surgery, The Ottawa Hospital, University of Ottawa, Canada; Clinical Epidemiology Program, Ottawa Hospital Research Institute, Canada. Electronic address: gumartel@ottawahospital.on.ca.