1. Digestive Endoscopy Unit; Catholic University; Rome Italy
2. Gastroenterology Department; Hospital Universitario de Canarias; La Laguna University; Santa Cruz de Tenerife Spain
3. Oncology Group; Asociación Española de Gastroenterología; Spain
4. Department of Clinical Research; Telemark Hospital; Skien Norway
5. Department of Health Management and Health Economics; Institute of Health and Society; University of Oslo; Oslo Norway
6. Centro Prevenzione Oncologica; Regione Piemonte and AOU Città della Salute e della Scienza; Turin Italy
7. Division of Gastroenterology/Hepatology; Indiana University Medical Center; Indianapolis IN USA