[1] Örebro University Hospital,Department of Orthopedics
[2] Nemours/AIfred I. duPont Hospital for Children,Department of Orthopedic Surgery
[3] Chang Gung Memorial Hospital,Department of Pediatric Orthopedics
[4] University of Gothenburg,Department of Orthopedics, Institute of Clinical Science, Sahlgrenska Academy
[5] Department of Orthopedics,undefined
[6] Skaraborg Hospital Skövde,undefined