Mehdi Zeinalizadeh1, Zahid Hussain Khan2. 1. Brain and Spinal Cord Injuries Repair Research Center (BASIR), Imam Khomeini Hospital, Tehran, Iran. AND Department of Neurological Surgery, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iran. 2. Brain and Spinal Cord Injuries Repair Research Center (BASIR), Imam Khomeini Hospital, Tehran, Iran. AND Department of Neuroanesthesiology, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iran.