1. Department of Neurology, Medical School, Isfahan University of Medical Sciences, Isfahan 81744-176, Iran
2. Medical School, Isfahan University of Medical Sciences, Isfahan 81744-176, Iran
3. Medical Students' Research Center, Isfahan University of Medical Sciences, Isfahan 81744-176, Iran
4. S.H.A. Research Center of Neurological-Ophthalmological Sciences (SHARNOS Co.), No. 9 Boroomand, Seyed-Alikhan, Chaharbagh Abbasi, Isfahan 81448-14581, Iran