Department of Gastroenterology, Hepatology and Transplant Medicine, University Hospital of Essen, University Duisburg-Essen, Hufelandstr. 55, 45147 Essen, Germany.
AMEOS Hospital, St. Clemens, Internal Medicine-Hepatology, Gastroenterology, Infectiology and Diabetology, Wilhelmstr. 34, 46145 Oberhausen, Germany.