1. Gait Analysis Laboratory, Department of Orthopedic Surgery, Copenhagen University Hospital, Hvidovre, Denmark
2. Department of Physical Therapy, Copenhagen University Hospital, Hvidovre, Denmark
3. Clinical Research Center, Copenhagen University Hospital, Hvidovre, Denmark
4. Department of Exercise and Sport Sciences, University of Copenhagen, Copenhagen, Denmark
5. Department of Pediatrics, Copenhagen University Hospital, Hvidovre, Denmark