1 Division of Neurology, Firoozgar Hospital, Iran University of Medical Sciences, Tehran, Iran.
2 Edmond J Safra Program in Parkinson's Disease and the Morton and Gloria Shulman Movement Disorders Clinic, Toronto Western Hospital, UHN, Division of Neurology, University of Toronto, Toronto, Ontario, Canada.
3 Division of Neurology, Atieh Hospital, Tehran, Iran.
4 Department of Neurology, School of Medicine, Isfahan Neuroscience Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
5 Division of Neurology, Hazrat Rasool Hospital, Iran University of Medical Sciences, Tehran, Iran.
6 Skull Base Research Center, Five Senses Health Institute, Iran University of Medical Sciences, Tehran, Iran.