1. Department of Medicine, Indira Gandhi Hospital, New Delhi, India;
2. Robert D and Patricia E Kern Center for the Science of Health Care Delivery, Mayo Clinic, Rochester, Minnesota, USA;
3. Division of Gastroenterology and Hepatology, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada;
4. Department of Community Health Sciences, University of Calgary, Calgary, Alberta, Canada;
5. Division of Gastroenterology, Department of Medicine, Western University, London, Ontario, Canada;
6. Department of Epidemiology & Biostatistics, Western University, London, Ontario, Canada;
7. Division of Gastroenterology, Department of Medicine, University of California San Diego, La Jolla, California, USA;
8. Division of Biomedical Informatics, Department of Medicine, University of California San Diego, La Jolla, California, USA.