1. Department of Radiation Oncology, Elazig Fethi Sekin City Hospital, Elazig, Turkey
2. Department of Radiology, Hacettepe University, Faculty of Medicine, Ankara, Turkey
3. Department of Preventive Oncology, Hacettepe University, Faculty of Medicine, Ankara, Turkey
4. Department of Radiation Oncology, Hacettepe University, Faculty of Medicine, Ankara, Turkey