1. Department of Veterans Affairs Palo Alto Health Care System; Spinal Cord Injury and Disorders Center; Palo Alto CA
2. Department of Neurosurgery; Stanford University School of Medicine; Stanford CA
3. Department of Physical Medicine and Rehabilitation; University of Pennsylvania; Philadelphia PA
4. Perelman School of Medicine University of Pennsylvania; Philadelphia PA
5. Center for Clinical Epidemiology and Biostatistics; University of Pennsylvania; Philadelphia PA
6. Department of Psychiatry; University of Pennsylvania; Philadelphia PA
7. Mental Illness Research Education and Clinical Center Philadelphia Veterans Affairs Medical Center; Philadelphia PA