1. Division of Gastroenterology, Hepatology, and Nutrition, Virginia Commonwealth University Medical Center, Richmond, Virginia, United States
2. Division of Gastroenterology, Zucker School of Medicine at Hofstra/Northwell, Long Island Jewish Medical Center, New Hyde Park, New York, United States
3. Division of Gastroenterology & Hepatology, Tufts Medical Center, Boston, Massachusetts, United States
4. Department of Internal Medicine, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States