1. National Centre for Ultrasound in Gastroenterology, Haukeland University Hospital, Bergen, Norway;
2. Department of Clinical Medicine, University of Bergen, Bergen, Norway;
3. Department of Pediatrics, Haukeland University Hospital, Bergen, Norway;
4. Department of Clinical Science, University of Bergen, Bergen, Norway;
5. Center for Medical Genetics and Molecular Medicine, Haukeland University Hospital, Bergen, Norway