1. Division of Gastroenterology, Hepatology, and Endoscopy, Department of Medicine; Brigham and Women’s Hospital; Boston Massachusetts
2. Harvard Medical School; Boston Massachusetts
3. Center for Clinical Epidemiology; Odense University Hospital; Odense Denmark
4. Department of Clinical Research, Research Unit of Clinical Epidemiology; University of Southern Denmark; Odense Denmark
5. Department of Medical Gastroenterology S; Odense University Hospital; Odense Denmark
6. Department of Clinical Research, Research Unit of Medical Gastroenterology; University of Southern Denmark; Odense C Denmark