1. Department of Neurology, Istanbul Training and Research Hospital, Istanbul

2. Department of Neurology, Bakirkoy Dr. Sadi Konuk Training and Research Hospital, Istanbul

3. Department of Neurology, Istanbul University Cerrahpasa Faculty of Medicine, Istanbul

4. Department of Neurology, Kocaeli Derince Training and Research Hospital, Izmit

5. Department of Neurosurgery, Bafra State Hospital, Samsun, all in Turkey