[1] Univ Pavia, Ist Ricovero & Cura Carattere Sci IRCCS Policlin, Dept Otorhinolaryngol, Via Palestro 3, I-27100 Pavia, Italy
[2] Univ Insubria, Osped Circolo, Dept Otorhinolaryngol, Varese, Italy
[3] Univ Insubria, Fdn Macchi, Varese, Italy
[4] Univ Insubria, Osped Circolo, Dept Surg & Morphol Sci, Infect & Trop Dis Unit, Varese, Italy
[5] Ist Ricovero & Cura Carattere Sci IRCCS Policlin, Lab Med Virol & Microbiol Unit, Pavia, Italy
[6] Univ Pavia, Ist Ricovero & Cura Carattere Sci IRCCS Policlin, Dept Haematol, Via Palestro 3, I-27100 Pavia, Italy