1. Digestive Endoscopy Unit, Catholic University, Rome, Italy
2. Gastroenterology Department, Hospital Universitario de Canarias-La Laguna University, Spain
3. Division of Gastroenterology and Hepatology, Geneva University Hospitals; Geneva, Switzerland
4. Department of Gastroenterology, Maria Sklodowska-Curie Memorial Cancer Center and Medical Centre for Postgraduate Education, Warsaw, Poland
5. Gastroenterology Department, Oporto Oncology Institute, Oporto, Portugal
6. Department of Gastroenterology, Cochin Hospital, Paris, France
7. Department of Gastroenterology and Hepatology, Academic Medical Center, Amsterdam, The Netherlands
8. Department of Internal Medicine III, Division of Gastroenterology and Hepatology, Medical University of Vienna, Vienna, Austria.
9. Oncology Group, Asociación Española de Gastroenterología, Spain
10. Department of Clinical Research, Telemark Hospital, Skien, Norway
11. Department of Health Management and Health Economics, Institute of Health and Society, University of Oslo, Oslo, Norway
12. Department of Medicine, Ruhr-Universität Bochum, Knappschaftskrankenhaus, Bochum, Germany
13. Centre for Digestive Diseases, The General Infirmary at Leeds, Leeds, United Kingdom
14. Oregon Health and Science University, Portland, Oregon