1. Department of Neurology, Bezmialem Vakif University Hospital, Istanbul, Turkey
2. Department of Neurology, Namik Kemal University Hospital, Tekirdag, Turkey
3. Department of Neurology, Baskent University Istanbul Hospital, Istanbul, Turkey
4. Department of Ophthalmology, Celal Bayar University Hospital, Manisa, Turkey
5. Department of Neurology, Memorial Hizmet Hospital, Istanbul, Turkey