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 Orthopaedics and Traumatology Tampere University Hospital Tampere Finland
6. Department of Obstetrics and Gynecology Tampere University Hospital Tampere Finland
7. Center for Child, Adolescent and Maternal Health Research, Faculty of Medicine and Health Technology Tampere University Tampere Finland