1 Faculty of Medicine and Life Sciences, University of Tampere, Tampere, Finland. Electronic address: matias.vaajala@tuni.fi.
2 Department of Obstetrics and Gynecology, Tampere University Hospital, Tampere, Finland; Center for Child, Adolescent and Maternal Health Research, Faculty of Medicine and Health, Finland.
3 Faculty of Medicine and Life Sciences, University of Tampere, Tampere, Finland; Department of Orthopaedics and Traumatology, Tampere University Hospital Tampere, Finland.
4 Department of Pediatrics, Kuopio University Hospital, Kuopio, Finland; Institute of Clinical Medicine and Department of Pediatrics, University of Eastern Finland, Kuopio, Finland.