1. Cedars-Sinai Medical Center, Los Angeles, California, USA
2. MedStar Georgetown University Hospital, Washington DC, USA
3. University of North Carolina, Chapel Hill, North Carolina, USA
4. Cleveland Clinic, Cleveland, Ohio, USA
5. Comprehensive Digestive Institute of Nevada, Las Vegas, Nevada, USA
6. Houston Methodist Hospital, Houston, Texas, USA
7. New York University Langone Medical Center, New York, New York, USA
8. NYU Grossman School of Medicine, Bellevue Hospital Center, New York, New York, USA
9. MNGI Digestive Health, Plymouth, Minnesota, USA
10. Ohio State University Wexner Medical Center, Columbus, Ohio, USA
11. Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
12. Yale University, New Haven, Connecticut, USA
13. Boston University School of Medicine, Boston, Massachusetts, USA