[1] Mustafa Kemal Univ, Dept Neurosurg, Antakya, Turkey
[2] Abant Izzet Baysal Univ, Dept Neurosurg, Bolu, Turkey
[3] Ankara Numune Training & Res Hosp, Ankara, Turkey
[4] Elmadag State Hosp, Ankara, Turkey
[5] Ankara Ataturk Res & Educ Hosp, Dept Neurosurg, Ankara, Turkey
[6] Gaziantep State Hosp, Neurosurg Clin, Gaziantep, Turkey