1. 1st Department of Otolaryngology Head and Neck Surgery, Hippokration General Hospital, School of Medicine, National and Kapodistrian Unversity of Athens, 114 Vas. Sophias Avnue, 11527 Athens, Greece
2. Department of Pathology, Hipporation General Hospital, 114 Vas. Sophias Avnue, 11527 Athens, Greece