1. 2nd ENT Dept. Univ. of Athens, “Attikon” University Hospital, Athens, Greece (PVV)
2. AKOS Anti-cancer Institute, Athens, Greece (AG)
3. Dept. of Neonatology, “Agios Panteleimon” General Hospital, Nikaia, Greece (ET)
4. Dept. of Radiation Oncology, Hygeia Hospital, Athens, Greece (DK)