1. Division of Gastroenterology, Hepatology, and Nutrition, Vanderbilt University Medical Center, Nashville, TN, USA
2. The Dr. Henry D. Janowitz Division of Gastroenterology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
3. Department of Gastroenterology and Hepatology, University Medical Center Utrecht, Utrecht, The Netherlands
4. Division of Gastroenterology, Surgical Department, Hospital Beatriz Ângelo, Loures, Portugal