1. Gastroenterology Section, Temple University, Philadelphia, Pennsylvania, United States
2. Gastroenterology Section, Department of Epidemiology, Johns Hopkins University, Baltimore, Maryland, United States
3. Gastroenterology Section, Texas Tech University Health Sciences Center, El Paso, Texas, United States
4. Gastroenterology Section, Harvard Medical School, Boston, Massachusetts, United States
5. Gastroenterology Department, Mayo Clinic, Rochester, Minnesota, United States
6. Gastroenterology Section, Baylor College of Medicine, Children’s Nutrition Research Center, Houston, Texas, United States
7. Gastroenterology Section, National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland, United States
8. Gastroenterology Section, University of Louisville, Louisville, Kentucky, United States
9. Section of Gastroenterology, Wake Forest University, Winston-Salem, North Carolina, United States