1. Faculty of Medicine and Health Sciences Norwegian University of Science and Technology Trondheim Norway
2. Department of Clinical and Molecular Medicine Norwegian University of Science and Technology Trondheim Norway
3. Department of Physical Medicine and Rehabilitation, St. Olavs Hospital Trondheim University Hospital Trondheim Norway
4. Children's Clinic, St. Olavs Hospital Trondheim University Hospital Trondheim Norway
5. Unit for Physiotherapy Services Trondheim Municipality Trondheim Norway
6. Department of Rehabilitation Science and Health Technology Oslo Metropolitan University Oslo Norway