1. Faculty of Medicine and Health Technology, University of Tampere, Tampere, Finland
2. Department of Surgery, Central Finland Central Hospital Nova, Jyväskylä, Finland
3. Department of Obstetrics and Gynecology, Tampere University Hospital, Tampere, Finland
4. Center for Child, Adolescent and Maternal Health Research, Tampere University, Tampere, Finland
5. Department of Orthopaedics and Traumatology, Tampere University Hospital Tampere, Finland
6. Department of Pediatrics, Mikkeli Central Hospital, Mikkeli, Finland
7. Institute of Clinical Medicine and Department of Pediatrics, University of Eastern Finland, Kuopio, Finland