1. Department of Internal Medicine, Hacettepe University, Ankara, 06230, Turkey
2. Department of Medical Oncology, Hacettepe University Cancer Institute, Ankara, 06230, Turkey
3. Department of Radiology, Hacettepe University, Ankara, 06230, Turkey
4. Department of Radiation Oncology, Hacettepe University, Ankara, 06230, Turkey
5. Department of Otorhinolaryngology & Head & Neck Surgery, Hacettepe University, Ankara, 06230, Turkey