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, University of Southern Denmark, Esbjerg, Denmark
5. Department of Medical Gastroenterology S, Odense University Hospital, Odense, Denmark
6. Research Unit of Medical Gastroenterology, Department of Clinical Research, University of Southern Denmark, Odense, Denmark
7. Hans Christian Andersen Children’s Hospital, Odense University Hospital, Odense, Denmark
8. Research Unit of Pediatrics, Department of Clinical Research, University of Southern Denmark, Odense, Denmark.