1. Department of Anatomic Pathology; University of Genova and IRCCS S.Martino/IST University Hospital; Genoa Italy
2. Department of Surgery; Sahlgrenska University Hospital; Gothenburg Sweden
3. Department of Surgery; North Tyneside General Hospital; North Shields UK
4. Department of Gastroenterology; Dr Horst Schmidt-Hospital; Wiesbaden Germany
5. Department of Gastroenterology and Hepatology; Nantes University and INSERM; Nantes France
6. Department of Medicine; Haukeland University Hospital; Bergen Norway
7. AstraZeneca Gothenburg; Mölndal Sweden
8. Formerly of AstraZeneca Gothenburg; Mölndal Sweden
9. Department of Surgery; Centre for Digestive Diseases; Karolinska University Hospital and CLINTEC; Karolinska Institutet; Stockholm Sweden