1. Department of Medicine, McGill University Health Centre, McGill University, Montreal, Quebec, Canada
2. Division of Gastroenterology, McGill University Health Centre, McGill University, Montreal, Quebec, Canada
3. Department of Epidemiology and Biostatistics and Occupational Health, McGill University Health Centre, McGill University, Montreal, Quebec, Canada
4. Department of Gastroenterology and GI Outcomes Unit, Rambam Health Care Campus, Bruce and Ruth Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel