作者单位:Medizinische Klinik, Spital Zollikerberg, Trichtenhauserstrasse 20, CH-8125 Zollikerberg, Zürich[1]Division of Gastroenterology and Hepatology, University Hospital, Basle, Switzerland[2]Division of Gastroenterology and Hepatology, University Hospital, Basle, Switzerland, Department of[3]