1. 1Kessler Medical Rehabilitation Research and Education Corporation, West Orange, NJ
2. 2Moss Rehabilitation Research Institute, Philadelphia, PA
3. 3University of Pennsylvania School of Medicine, Philadelphia
4. 4National Institute of Neurological Disorders and Stroke, Bethesda, MD
5. 5University of Florida School of Medicine, Gainesville
6. 6Johns Hopkins University School of Medicine, Baltimore
7. 7Harvard Medical School, Boston
8. 8Trinity College, Dublin