1. Center for Clinical Epidemiology Odense University Hospital Odense Denmark
2. Research Unit of Clinical Epidemiology, Department of Clinical Research University of Southern Denmark Odense Denmark
3. Department of Medicine Hospital of Southwest Jutland Esbjerg Denmark
4. Department of Regional Health Science, Center Southwest Jutland University of Southern Denmark Esbjerg Denmark
5. Hans Christian Andersen Children's Hospital Odense University Hospital Odense Denmark
6. Research Unit of Pediatrics, Department of Clinical Research University of Southern Denmark Odense Denmark
7. Department of Clinical and Molecular Medicine Norwegian University of Science and Technology Trondheim Norway
8. Department of Medical Gastroenterology S Odense University Hospital Odense Denmark
9. Research Unit of Medical Gastroenterology, Department of Clinical Research University of Southern Denmark Odense Denmark