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. Institute for Regional Health Science; Center Southwest Jutland; 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 Pediatric; Department of Clinical Research; University of Southern Denmark; Odense Denmark