1. Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
2. Department of Gastroenterology, University College London Hospitals, London, United Kingdom
3. Department of Interdisciplinary Endoscopy, Medical Department 1, University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany
4. Department of Gastroenterology, GI Oncology, GI-ID, Nutritional Medicine, Kliniken der Stadt Köln, Köln, Germany
5. Department of Gastroenterological Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
6. Gastroenterology and Interventional Endoscopy Unit, Local Health Authority of Bologna, Bologna, Italy