1. Wake Forest School of Medicine, Winston-Salem, North Carolina, United States
2. W. G. (Bill) Hefner VA Healthcare System, Salisbury, North Carolina, United States
3. Yale School of Medicine, New Haven, Connecticut, United States
4. Loyola University Stritch School of Medicine, Maywood, Illinois, United States
5. Hines VA Hospital, Hines, Illinois, United States
6. University of Rochester Medical Center, Rochester, New York, United States
7. Gastroenterology Consultants, PC, Medford, Oregon, United States
8. Mayo Clinic, Scottsdale, Arizona, United States
9. Cleveland Clinic, Cleveland, Ohio, United States