1. Division of Digestive and Liver Diseases; UT Southwestern Medical Center; Dallas TX USA
2. Department of Public Health Sciences; Medical University of South Carolina; Charleston SC USA
3. Department of Gastroenterology; Massachusetts General Hospital; Boston MA USA
4. Division of Gastroenterology; VCU Medical Center; Richmond VA USA
5. Division of Gastroenterology; University of Pennsylvania Perelman School of Medicine; Philadelphia PA USA
6. Division of Gastroenterology; University of Michigan Health System; Ann Arbor MI USA
7. Division of Gastroenterology and Hepatology; UAB School of Medicine; Birmingham AL USA
8. California Pacific Medical Center; San Francisco CA USA