1 From the Department of Neurology (E.M.A.), Faculty of Medicine, Hacettepe University, Ankara, Turkey; and Division of Biostatistics, Department of Epidemiology and Population Health, Saul R. Korey Department of Neurology (C.B.H.), Albert Einstein College of Medicine, Bronx, NY. arsavaem@hotmail.com.
2 From the Department of Neurology (E.M.A.), Faculty of Medicine, Hacettepe University, Ankara, Turkey; and Division of Biostatistics, Department of Epidemiology and Population Health, Saul R. Korey Department of Neurology (C.B.H.), Albert Einstein College of Medicine, Bronx, NY.