1. Division of Gastroenterology and Hepatology, Geneva’s University Hospitals and University of Geneva, Geneva, Switzerland
2. Division of Gastroenterology, McGill University Health Center, McGill University, Montreal, Canada
3. Internal Medicine Department, La Tour Hospital and University of Geneva, Switzerland
4. Department of Medicine, University of Sherbrooke, Sherbrooke, Canada
5. Division of Epidemiology and Biostatistics and Occupational Health, McGill University Health Center, McGill University, Montreal, Canada