1. Department of Neurosurgery, Razavi Hospital, Mashhad, Iran
2. Department of Neurosurgery, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran
3. Department of Neurosurgery, Ghaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
4. Department of Clinical Sciences, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
5. Department of Radiology, Shariati Hospital, Tehran University of Medical Sciences, Tehran, Iran
6. Department of Neurosurgery, Golestan Hospital, Tehran, Iran