1. Division of Gastroenterology and Hepatology, Stanford University, Redwood City
2. Division of Gastroenterology and Hepatology, University of California, San Francisco, San Francisco, CA
3. Division of Gastroenterology, Duke University School of Medicine & Duke Clinical Research Institute, Durham, NC
4. Department of Gastroenterology and Hepatology, Amsterdam University Medical Center, Amsterdam, Utrecht, The Netherlands
5. Division of Gastroenterology, Washington in St. Louis, St. Louis, MO
6. Division of Gastroenterology, Columbia University, New York, NY
7. Division of Gastroenterology, University of Alberta, Edmonton, AB, Canada
8. Division of Gastroenterology, Feinberg School of Medicine, Northwestern University, Chicago, IL
9. Gastroenterology Unit, University of Milan, Fondazione IRCCS Cà Granda Ospedale Policlinico, Milan, Italy
10. Digestive Physiology, Lyon I Hospices Civils de Lyon, Lyon, France
11. Department of Surgery, Oncology and Gastroenterology,University of Padua, Padua, Veneto, Italy
12. Division of Gastroenterology, Mayo Clinic, Scottsdale, AZ
13. Division of Gastroenterology & Hepatology, Oregon Health & Science University, Portland, OR