1. Department of Orthopedics and Traumatology, Helsinki University Central Hospital, Helsinki, Finland
2. Department of Pediatric Surgery, Kuopion Yliopistollinen Sairaala, Kuopio, Pohjois-Savo, Finland
3. Department of Pediatric Surgery and Orthopedics, Oulu University Hospital, PEDEGO Research Group and Medical Research Center Oulu, Oulu, Finland
4. Department of Pediatric Surgery, Tampere University Hospital, Tampere, Finland
5. Department of Pediatric Surgery, Turku University Hospital, Turku, Finland
6. Department of Orthopaedics, Helsingin Yliopisto Lasten ja Nuorten Klinikka, Helsinki, Finland
7. Department of Orthopaedic Surgery, Helsingin Yliopisto Lasten ja Nuorten Klinikka, Helsinki, Finland