[1] Dr Sami Ulus Training & Res Hosp, Dept Orthopaed & Traumatol, Ankara, Turkey
[2] Dr Abdurrahman Yurtaslan Onkol Hosp, Dept Orthopaed & Traumatol, Ankara, Turkey
[3] Necmettin Erbakan Univ, Meram Sch Med, Dept Orthopaed & Traumatol, Konya, Turkey
[4] Univ Stellenbosch, Tygerberg Acad Hosp, Spinal Unit Orthopaed & Traumatol, Cape Town, South Africa
[5] Yozgat State Hosp, Clin Orthopaed & Traumatol, Yozgat, Turkey
[6] Gazi Univ, Sch Med, Dept Orthopaed & Traumatol, Ankara, Turkey