1. Unit of Pediatric Surgery and Orthopedics, Oulu University Hospital, and, PEDEGO Research Unit and MRC Oulu, Oulu Childhood Trauma and Sports Injury Study, University of Oulu, Oulu, Finland
2. Department of Pediatric Surgery, Kuopio University Hospital, Kuopio, Finland
3. Department of Pediatric Orthopedics and Traumatology, New Children’s Hospital, Helsinki University Hospital, Helsinki, Finland