1. Division of Gastroenterology; Washington University School of Medicine; St. Louis MO USA
2. Digestive Physiology; Hospices Civils de Lyon and Lyon I University and Inserm U1032; LabTAU; Lyon France
3. Gastroenterology and Hepatology; Academic Medical Center; Amsterdam The Netherlands
4. Department of Gastroenterology; Abdominal Center; St. Claraspital; Basel Switzerland
5. Department of Internal Medicine; Israelitic Hospital; University of Hamburg; Hamburg Germany
6. Division of Gastroenterology; Department of Medicine; Northwestern University; Chicago IL USA
7. Center for Digestive Diseases; Bart's and the London School and Dentistry; London UK
8. Department of Surgery; University of Washington; Seattle WA USA
9. Division of Gastroenterology; Department of Surgical; Oncological and Gastroenterological Sciences; Padua Italy