1. Department of Gastroenterology Kansas City VA Medical Center Kansas City Missouri USA
2. Division of Gastroenterology, Hepatology and Motility University of Kansas School of Medicine Kansas City Missouri USA
3. Department of Biostatistics St. Luke's Hospital Kansas City Missouri USA
4. Division of Gastroenterology, Hepatology and Endoscopy Brigham and Women's Hospital and Harvard Medical School Boston Massachusetts USA
5. Division of Gastroenterology, Hepatology and Nutrition Keck School of Medicine University of Southern California Los Angeles California USA
6. Division of Gastroenterology and Hepatology, Department of Medicine NYU Langone Medical Center New York New York USA
7. Section of Gastroenterology and Hepatology Dartmouth‐Hitchcock Medical Center Lebanon New Hampshire USA
8. Department of Gastroenterology and Hepatology Indiana University School of Medicine Indianapolis Indiana USA
9. Division of Digestive and Liver Diseases Columbia University Medical Center New York New York USA
10. Gastroenterology, Hepatology and Nutrition University of Chicago Medicine Chicago Illinois USA
11. Department of Gastroenterology and Hepatology Mayo Clinic Rochester Minnesota USA
12. Department of Gastroenterology and Hepatology Mayo Clinic Jacksonville Florida USA
13. Digestive Endoscopy Unit IRCCS Humanitas Research Hospital Milan Italy
14. Department of Biomedical Sciences Humanitas University Milan Italy