1. Department of Gastroenterology, Chaim Sheba Medical Center, Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel
2. Department of Gastroenterology, Skåne University Hospital, Malmö, Lund University, Sweden
3. Department of Gastroenterology – NHC, Pamplona, Spain
4. Endoscopy Unit, Centre for Liver and Digestive Disorders, The Royal Infirmary of Edinburgh, Scotland, UK