1. Research Unit of Clinical Medicine, Medical Research Center, Oulu Childhood Fracture and Sports Injury Study, Division of Pediatric Surgery and Orthopedics, Department of Children and Adolescents, (MRC) Oulu, Oulu University Hospital, Oulu University, 90220 Oulu, Finland
2. Research Unit of Health Sciences and Technology, Department of Radiology, Oulu University Hospital, Oulu University, 90220 Oulu, Finland
3. Research Service Unit, Research Unit of Clinical Medicine, Oulu University Hospital, 90220 Oulu, Finland
4. Department of Pediatric Surgery and Pediatric Urology, University Children’s Hospital of Tübingen, 72076 Tübingen, Germany