[1] Univ Helsinki, Dept Otorhinolaryngol Head & Neck Surg, Helsinki, Finland
[2] Helsinki Univ Hosp, Helsinki, Finland
[3] Univ Helsinki, Res Program Syst Oncol, Fac Med, Helsinki, Finland
[4] Karolinska Inst, Dept Clin Sci Intervent & Technol, Div Ear Nose & Throat Dis, Stockholm, Sweden
[5] Karolinska Hosp, Stockholm, Sweden
[6] Univ Helsinki, Dept Pathol, Helsinki, Finland
[7] Univ Turku, Inst Biomed, Pathol, Turku, Finland
[8] Univ Misurata, Fac Dent, Misurata, Libya
[9] Univ Helsinki, Dept Chem, Helsinki, Finland
[10] Univ Edinburgh, NHS Lothian, Dept Otolaryngol Head & Neck Surg, Edinburgh, Midlothian, Scotland
[11] Atlantic Hlth Syst, Morristown Med Ctr, Dept Med, Div Hematol Oncol, Morristown, NJ USA
[12] Univ Oviedo, Hosp Univ Cent Asturias, Dept Otolaryngol, ISPA,IUOPA,CIBERONC, Oviedo, Spain
[13] Emory Univ, Winship Canc Inst, Dept Hematol & Med Oncol, Atlanta, GA 30322 USA
[14] Katholieke Univ Leuven, Univ Hosp Leuven, Otorhinolaryngol Head & Neck Surg, Leuven, Belgium
[15] Katholieke Univ Leuven, Univ Hosp Leuven, Dept Oncol, Sect Head & Neck Oncol, Leuven, Belgium
[16] Int Head & Neck Sci Grp, Padua, Italy