1 Neurosurgery Clinic, Fatih Sultan Mehmet Training and Research Hospital, Istanbul, Turkey. tayfunhakan@yahoo.com.
2 Fatih Sultan Mehmet Eğitim ve Araştırma Hastanesi, Beyin ve Sinir Cerrahisi Kliniği Hastane Sokak, No:1/8 İçerenköy - Ataşehir, 34752, Istanbul, Turkey. tayfunhakan@yahoo.com.