1. Department of Otorhinolaryngology-Head and Neck Surgery, 'G. Papanikolaou' General Hospital, Thessaloniki, Greece
2. Fourth Department of Surgery, School of Medicine, Aristotle University of Thessaloniki, 'G. Papanikolaou' General Hospital, Thessaloniki, Greece
3. First Department of Dermatology and Venereology, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece
4. Second Department of Paediatrics, School of Medicine, Aristotle University of Thessaloniki, AHEPA University Hospital, Thessaloniki, Greece
5. Second Academic ORL, Head and Neck Surgery Department, Aristotle University of Thessaloniki, Papageorgiou Hospital, Thessaloniki, Greece
6. Department of Pathology, 'G. Papanikolaou' General Hospital, Thessaloniki, Greece