1. Department of Surgery; Campus Charité Mitte and Campus Virchow-Klinikum; Charité - Universitätsmedizin Berlin; Berlin Germany
2. Medical Department; Division of Hepatology and Gastroenterology; Campus Virchow Klinikum; Charité - Universitätsmedizin Berlin; Berlin Germany
3. Evangelisches Krankenhaus Paul Gerhardt Stift; Lutherstadt Wittenberg Germany