1. Division of Gastroenterology, McMaster University, Hamilton, ON, Canada
2. Cochrane Upper GI and Pancreatic Group, Hamilton, ON, Canada
3. Division of Gastroenterology, Hepatology, and Endoscopy, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, USA
4. Division of Gastroenterology, McGill University Health Sciences, Montreal QC, Canada