1. Department of Medicine I, University of Erlangen-Nuremberg, Erlangen, Germany
2. Emergency Unit, Central Hospital Augsburg, Augsburg, Germany
3. Department of Medicine 2, Martha Maria Hospital, Nuremberg, Germany
4. Department of Medicine I, University of Erlangen-Nuremberg, Erlangen, Germany and Gastroenterology Clinic Dr. Kerzel / PD Dr. Maiss, Forchheim, Germany