1. Department of Neurosurgery, University of Maryland School of Medicine, Baltimore, Maryland, USA.
2. R Adams Cowley Shock Trauma Center, University of Maryland School of Medicine, Baltimore, Maryland, USA.
3. Department of Neurosurgery, Tehran University of Medical Sciences, Tehran, Iran.
4. Department of Neurosurgery, Shiraz University of Medical Sciences, Shiraz, Iran.
5. Division of Neurosurgery, Zahedan University of Medical Sciences, Zahedan, Iran.
6. Department of Neurosurgery, Tabriz University of Medical Sciences, Tabriz, Iran.
7. Department of Neurosurgery, Esfahan University of Medical Sciences, Esfahan, Iran.
8. Department of Neurosurgery, Mashhad University of Medical Sciences, Mashhad, Iran.
9. Department of Neurosurgery, Beheshti University of Medical Sciences, Tehran, Iran.