[1] Royal Natl ENT & Eastman Dent Hosp, Dept Ear Nose & Throat, London, England
[2] UCL, Ear Inst, London, England
[3] Univ Padua, Dept Neurosci, Otolaryngol Sect, Padua, Italy
[4] Univ Padua, Dept Stat Sci, Padua, Italy
[5] Univ Padua, Dept Math Tullio Levi Civita, Padua, Italy
[6] Univ Hosp Padova, Unit Infect Dis, Padua, Italy
[7] Whittington Hlth, Dept Microbiol, London, England