1. Departments of Pediatrics (M.V., H.R., P.R.N.), Haukeland University Hospital, N-5021 Bergen, Norway
2. Radiology (I.S.H.), Haukeland University Hospital, N-5021 Bergen, Norway
3. Section for Radiology (I.S.H.), University of Bergen, N-5020 Bergen, Norway
4. Department of Clinical Medicine (M.V., H.R., P.R.N.), University of Bergen, N-5020 Bergen, Norway
5. Pathology (A.M.), Haukeland University Hospital, N-5021 Bergen, Norway
6. Department of Surgical Sciences, and The Gade Institute (A.M.), University of Bergen, N-5020 Bergen, Norway