1. Department of Rehabilitation, Laval University, and Centre for Interdisciplinary Research in Rehabilitation and Social Integration, Quebec City, Quebec, Canada
2. Glenrose Rehabilitation Hospital, Alberta Health Services and Department of Physical Therapy, University of Alberta, Edmonton, Alberta, Canada
3. Center for Cerebral Palsy, Orthopaedic Institute for Children, Department of Orthopaedic Surgery, Tarjan Center, University of California, Los Angeles, CA, USA
4. Brain Center Rudolf Magnus and Center of Excellence for Rehabilitation Medicine, University Medical Center Utrecht and Rehabilitation Center De Hoogstraat, Utrecht, the Netherlands
5. Rehabilitation Medicine Department, Clinical Center, National Institutes of Health, Bethesda, MD, USA