Ghaemeh Nabaei1, Siamak Abdi2, Farzad Fatehi3. 1. Department of Neurology, Shariati Hospital, Tehran University of Medical Sciences, Jalal-e-Al-e-Ahmad Hwy, Tehran, Islamic Republic of Iran. nabaei.gh@gmail.com. 2. Department of Neurology, Shariati Hospital, Tehran University of Medical Sciences, Jalal-e-Al-e-Ahmad Hwy, Tehran, Islamic Republic of Iran. siamak.abdi@yahoo.com. 3. Department of Neurology, Shariati Hospital, Tehran University of Medical Sciences, Jalal-e-Al-e-Ahmad Hwy, Tehran, Islamic Republic of Iran. fatehifa@gmail.com.