1. Department of Radiation Oncology, Adana City Training and Research Hospital, Adana, Turkey
2. Department of Biostatistics, Faculty of Medicine, Van Yüzüncü Yıl University, Van, Turkey
3. Department of Neurosurgery, Adana City Training and Research Hospital, Adana, Turkey
4. Department of Microbiology, Çukurova University School of Medicine, Adana, Turkey