1. Department of Children and Adolescents, Oulu University Hospital, Oulu, Finland;
2. PEDEGO Research Unit, University of Oulu, Oulu, Finland;
3. Department of Diagnostic Radiology, Oulu University Hospital, Oulu, Finland;
4. Research Unit of Medical Imaging, Physics and Technology, University of Oulu, Oulu, Finland;
5. Department of Women’s and Children’s Health, Uppsala University, Uppsala, Sweden;
6. Department of Surgery, Oulu University Hospital, Oulu, Finland