[1] Hacettepe Univ, Fac Med, Dept Radiat Oncol, TR-06100 Ankara, Turkey
[2] Gulhane Mil Med Acad, Ankara, Turkey
[3] Hacettepe Univ, Fac Med, Dept Pathol, TR-06100 Ankara, Turkey
[4] Hacettepe Univ, Fac Med, Dept Ear Nose & Throat Surg, TR-06100 Ankara, Turkey