1. Division of Gastroenterology, Surgical Department, Hospital Beatriz Ângelo, Loures, Portugal
2. Division of Gastroenterology, Department of Medicine, University of Alberta, Edmonton, AB, Canada
3. Division of Internal Medicine, Mount Sinai St. Luke's and Mount Sinai West Hospitals, New York, NY, USA
4. Division of Gastroenterology, Icahn School of Medicine at Mount Sinai, New York, NY, USA