1. VU University Medical Center; Department of Rehabilitation Medicine, MOVE Research Institute Amsterdam; De Boelelaan 1118 Amsterdam Netherlands 1007 MB
2. University of Toronto; Department of Physical Therapy; 160-500 University Avenue Toronto ON Canada M5G 1V7
3. VU University Medical Center; Departments of Neurology and Clinical Epidemiology and Biostatistics; PO Box 7057 Amsterdam Netherlands 1007 MB