1. Department of Virology; “St. Savvas” Regional Anticancer Oncology Hospital of Athens; Athens Greece
2. Department of Otolaryngology, Head and Neck Surgery; “St. Savvas” Regional Anticancer Oncology Hospital of Athens; Athens Greece
3. Department of Otolaryngology, Head and Neck Surgery; “Hippokration” General Hospital; National University of Athens; Athens Greece
4. Department of Radiotherapy; “St. Savvas” Regional Anticancer Oncology Hospital of Athens; Athens Greece