1. Center for Advanced Endoscopy, Division of Gastroenterology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, United States
2. Division of Gastroenterology & Hepatology, Johns Hopkins Hospital, Baltimore, Maryland, United States
3. Department of Gastroenterology & Hepatology, Cleveland Clinic Florida, Weston, Florida, United States
4. Division of Gastroenterology and Liver Disease, University Hospitals & Case Western Reserve University School of Medicine, Cleveland, Ohio, United States
5. Division of Gastroenterology & Hepatology, Allegheny Health Network, Pittsburgh, Pennsylvania, United States