Institution: | Departments of;Gastroenterology and;Medical Microbiology, Faculty of Medicine, Vrije Universiteit, Amsterdam, The Netherlands;;Department of Gastroenterology and Hepatology, Dijkzigt University Hospital, Rotterdam, The Netherlands;;Department of Microbiology, Institute of Medical Microbiology and Hygiene, University of Freiburg, Freiburg, Germany;;Present address: Department of Gastroenterology and Hepatology, Dijkzigt University Hospital, Rotterdam, The Netherlands |