School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran. Department of Neurology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran. Department of Radiology, Medical Imaging Center, Imam Khomeini Hospital Complex, Tehran University of Medical Sciences, Tehran, Iran. Ayatollah Kashani Hospital, Isfahan University of Medical Sciences, Isfahan, Iran. Kliniken Schmieder Stuttgart-Gerlingen, Gerlingen, Germany.