Dtsch Arztebl Int 2015 Mar;112(13):224-33; quiz 234
Department of Internal Medicine and Gastroenterology, Diakonie Klinikum, Jung-Stilling Hospital, Siegen, Department of General Practice, Internal Medicine and Gastroenterology, HELIOS Hospital Berlin-Buch, Institute of Pathology, Ruhr-University Bochum, Dr.-Horst-Schmidt-Kliniken, Wiesbaden, Department of General, Visceral and Cancer Surgery, University of Cologne.