1. The Spinal Cord Damage Research Center, and Department of Rehabilitation Medicine, Mount Sinai Medical Center, New York, NY
2. Department of Medicine, Mount Sinai Medical Center, New York, NY, and Medical Services, Veterans Affairs Medical Center, Bronx, NY
3. The Spinal Cord Damage Research Center, Mount Sinai Medical Center, New York, NY, and Medical Services, Veterans Affairs Medical Center, Bronx, NY