1. Department of Regional Health Research, University of Southern Denmark, Odense, Denmark
2. Department of Surgical Gastroenterology, Esbjerg Hospital, University Hospital of Southern Denmark, Odense, Denmark
3. University of Southern Denmark, Odense, Denmark
4. Center for Clinical Epidemiology, Odense University Hospital, Odense, Denmark
5. Department of Clinical Research, University of Southern Denmark, Odense, Denmark
6. Department of Medical Gastroenterology, Esbjerg Hospital, University Hospital of Southern Denmark, Odense, Denmark