1. Division of Gastroenterology; University of California San Diego; La Jolla CA USA
2. Division of Biomedical Informatics; University of California San Diego; La Jolla CA USA
3. Gastroenterology Unit; Amiens University and Hospital; Université de Picardie Jules Verne; Amiens France
4. Robert D and Patricia E Kern Center for the Science of Health Care Delivery; Mayo Clinic; Rochester MN USA