1. Division of Gastroenterology, University of Montreal Hospital Center (CHUM), Montreal, Quebec, Canada
2. Department of Gastroenterology, University of Montreal Hospital Research Center (CRCHUM), Montreal, Quebec, Canada
3. Division of Gastroenterology and Hepatology, McGill University Health Centre, McGill University, Montreal, Quebec, Canada
4. Dartmouth Geisel School of Medicine, Hanover, NH, USA
5. Section of Gastroenterology and Hepatology, VA White River Junction, White River Junction, VT, USA
6. Department of Library, University of Montreal Hospital Center (CHUM), Montreal, Quebec, Canada
7. Department of Mathematics and Statistics, University of Montreal, Montreal, Quebec, Canada