1. Department of Gastroenterology, Research Center of Gastroenterology and Hepatology Craiova, University of Medicine and Pharmacy Craiova, Craiova, Romania
2. Department of Medicine 2, Caritas-Krankenhaus, Bad Mergentheim, Germany
3. Department of Surgical Gastroenterology, Herlev Hospital, Endoscopic Unit at Gentofte Hospital, Copenhagen University, Copenhagen, Denmark