1. Orthopedic Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
2. Department of Radiology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
3. Clinical Research Development Unit, Ghaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran.
4. Department of Neurosurgery, Shahid Beheshti University of Medical Sciences, Tehran, Iran.