1. School of Public Health, University of Tampere, Tampere, Finland; Paediatric Research Centre, University of Tampere, Tampere, Finland; Department of Paediatrics, Hämeenlinna Central Hospital, Hämeenlinna, Finland; Tampere University Hospital, Tampere, Finland
2. School of Public Health, University of Tampere, Tampere, Finland; Department of Paediatrics, Hämeenlinna Central Hospital, Hämeenlinna, Finland
3. Tampere Research Centre of Sports Medicine, UKK Institute, Tampere, Finland
4. Injury and Osteoporosis Research Centre, UKK Institute for Health Promotion Research, Tampere, Finland; Medical School, University of Tampere, Tampere, Finland; Division of Orthopaedics and Traumatology, Department of Trauma, Musculoskeletal Surgery and Rehabilitation, Tampere University Hospital, Tampere, Finland