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