1. Departments of Physical Medicine & Rehabilitation and Neurosurgery, Harvard Medical School/Spaulding Rehabilitation Hospital Network, Brigham and Women's Hospital, and Massachusetts General Hospital; Boston Massachusetts
2. Division of Spinal Cord Injury Research, VA Boston Healthcare System; Boston Massachusetts
3. Department of Neurosurgery, Wuhan Union Hospital, Huazhong University of Science and Technology; Wuhan Hubei China
4. Department of Neurosurgery, Taksim Education and Teaching Hospital, University of Healthsciences; Istanbul Turkey