1. Sports Medicine Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Tehran, Iran.
2. Department of Neurosurgery, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran.
3. Sina Trauma and Surgery Research Center, Tehran University of Medical Sciences, Tehran, Iran.
4. School of Medicine, Iran University of Medical Sciences, Tehran, Iran.
5. Department of Cardiology, Taleghani Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
6. Division of Neurosurgery, Department of Clinical Neurosciences, Addenbrooke's Hospital, University of Cambridge, Cambridge, United Kingdom.
7. Spinal Cord Injury Center, Balgrist University Hospital, Zurich, Switzerland.
8. Department of Neurosurgery, NYU Grossman School of Medicine, New York, New York, USA.
9. Department of Neurosurgery, Carle Foundation Hospital, Urbana, Illinois, USA.
10. Carle Illinois College of Medicine, University of Illinois Urbana Champaign, Champaign, Illinois, USA.
11. Division of Spine and Peripheral Nerve Surgery, Departments of Neurological and Orthopedic Surgery, Thomas Jefferson University, Philadelphia, Pennsylvania, USA.
12. Department of Neurological Surgery, University of California, Davis, California, USA.