1. Division of Gastroenterology, McMaster University, Hamilton Ontario, Canada
2. Division of Gastroenterology and Hepatology, Medical University of South Carolina, Charleston, South Carolina, USA
3. Division of Gastroenterology/Hepatology, Indiana University Medical Center, Indianapolis, Indiana, USA
4. Gastroenterology, Methodist Dallas Medical Center, Dallas, Texas, USA
5. Midwest Therapeutic Endoscopy Consultants, St Louis, Missouri, USA
6. University of Minnesota Medical School, Minneapolis, Minnesota, USA
7. Gastroenterology and Hepatology, Virginia Mason Medical Center, Seattle, Washington, USA
8. Department of Endoscopy, School of Medicine, Yale University, New Haven, Connecticut, USA
9. Gastroenterology and Hepatology, University of Alabama, Birmingham, Alabama, USA
10. Gastroenterology, University of Michigan, Ann Arbor, Michigan, USA
11. Division of Gastroenterology and Hepatology, Florida Hospital, Orlando, Florida, USA