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