1. Department of Neurosurgery, Dr. Lutfi Kirdar Education and Research Hospital, Istanbul, Turkey
2. Department of Neurosurgery, Sakarya University, Sakarya, Turkey
3. Department of Ophthalmology Selcuk University, Selcuklu Medical School, Konya, Turkey
4. Department of Neurosurgery, Selcuk University, Selcuklu Medical School, Konya, Turkey