1. Department of Medical, Division of Gastroenterology, Campus Virchow-Klinikum, Charité University Medicine, Berlin, Germany
2. Division of Hand, Plastic and Aesthetic Surgery, University Hospital, LMU Munich, Germany
3. Department of Medical, Division of Gastroenterology, Oncology, Hematology, Rheumatology and Diabetes, Ruppiner Kliniken, Brandenburg Medical School, Neuruppin, Germany