1. 2nd Academic ORL, Head and Neck Surgery Department, Aristotle University of Thessaloniki, Papageorgiou Hospital, Thessaloniki, Greece
2. Department of Pathology, “G. Papanikolaou” General Hospital, Thessaloniki, Greece
3. Department of Otorhinolaryngology-Head and Neck Surgery, “G. Papanikolaou” General Hospital, Thessaloniki, Greece
4. 1st Academic ORL, Head and Neck Surgery Department, Aristotle University of Thessaloniki, AHEPA Hospital, Thessaloniki, Greece