[1] VA Hosp NIMTS, Dept Cytol, Athens 401, Greece
[2] Natl & Kapodistrian Univ Athens, Dept Pathol, Med Sch, Athens, Greece
[3] Harvard Med Sch, Dept CME, Boston, MA 02115 USA
[4] Natl & Kapodistrian Univ Athens, Hippocrat Hosp, ENT Dept 1, Athens, Greece
[5] Univ Patras, Med Sch, Dept Otorhinolaryngol Head & Neck Surg, Patras, Greece
[6] Univ Ioannina, Sch Hlth Sci, Dept Maxillofacial Surg, Ioannina, Greece
[7] Natl Hellen Res Fdn, Photon Nanoapplicat Lab, Theoret & Phys Chem Inst, Athens, Greece
[8] Univ Ioannina, Sch Hlth Sci, Dept Obstet & Gynaecol, Ioannina, Greece