1. Department of Otolaryngology, University Hospital of Patras, 26504 Patras, Greece
2. Department of Otolaryngology, General Hospital of Nikaia, Piraeus ‘Agios Panteleimon’, 18454 Athens, Greece
3. Children's Oncology Unit Marianna V. Vardinoyannis‑ELPIDA, Aghia Sophia Children's Hospital, 11527 Athens, Greece
4. Department of Ophthalmology, Medical School, University of Patras, 26504 Patras, Greece
5. 1st Department of Otolaryngology, Hippocrateion Hospital, National and Kapodistrian University of Athens, 11527 Athens, Greece