Institution: | 1. Department of Pediatric Surgery, Rikshospitalet University Hospital, Oslo, Norway;2. Department of Psychosomatic Medicine, Rikshospitalet University Hospital, Oslo, Norway;3. Department of Biostatistics, Rikshospitalet University Hospital, Oslo, Norway (past affiliation) and Department of Medical Genetics Oslo, Ullevaal University Hospital, Oslo, Norway (current affiliation);4. Department of Obstetrics and Gynecology, Rikshospitalet University Hospital, Oslo, Norway;5. Department of Pediatrics, Sørlandet Hospital, Arendal, Norway;6. Department of Obstetrics and Gynecology, Sørlandet Hospital, Arendal, Norway;7. Department of Pediatrics, Rikshospitalet University Hospital, Oslo, Norway |