[1] Univ Maryland, Sch Med, Dept Neurosurg, Baltimore, MD USA
[2] Univ Maryland, Sch Med, R Adams Cowley Shock Trauma Ctr, Baltimore, MD USA
[3] Univ Tehran Med Sci, Dept Neurosurg, Tehran, Iran
[4] Shiraz Univ Med Sci, Dept Neurosurg, Shiraz, Iran
[5] Tabriz Univ Med Sci, Dept Neurosurg, Tabriz, Iran
[6] Esfahan Univ Med Sci, Dept Neurosurg, Esfahan, Iran
[7] Mashhad Univ Med Sci, Dept Neurosurg, Mashhad, Iran
[8] Beheshti Univ Med Sci, Dept Neurosurg, Tehran, Iran
[9] Zahedan Univ Med Sci, Div Neurosurg, Zahedan, Iran
[10] Univ Maryland, Sch Med, Dept Neurosurg, 22 South Greene St,Suite S-12-D, Baltimore 21201, MD USA