1. Tampere University, Faculty of Medicine and Health Technologies, Tampere, Finland
2. Department of Surgery, Central Finland Hospital Nova, Jyvaskyla, Finland
3. University of Eastern Finland, Institute of Clinical Medicine and Department of Pediatrics, Kuopio, Finland
4. Department of Orthopaedics and Traumatology, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
5. Department of Paediatric Orthopaedics, Helsinki University Hospital, New Children’s Hospital, Helsinki, Finland
6. Department of Pediatrics and Neonatology, Mikkeli Central Hospital, Mikkeli, Finland