1. Faculty of Medicine and Life Sciences University of Tampere Tampere Finland
2. Department of Obstetrics and Gynecology Tampere University Hospital Tampere Finland
3. Faculty of Medicine and Health Center for Child, Adolescent and Maternal Health Research Tampere Finland
4. Department of Orthopedics and Traumatology Tampere University Hospital Tampere Tampere Finland
5. Department of Pediatrics Kuopio University Hospital Kuopio Finland
6. Institute of Clinical Medicine and Department of Pediatrics University of Eastern Finland Kuopio Finland