[1] Univ Bologna, St Orsola Malpighi Hosp, Head & Neck & Sensory Organs Dept, Otorhinolaryngol Head & Neck Surg Unit, Bologna, Italy
[2] Univ Bologna, St Orsola Malpighi Hosp, Ist Seragnoli Specialist Diagnost & Expt Med, Haematol Unit, Bologna, Italy
[3] Univ Bologna, St Orsola Malpighi Hosp, Dept Med & Surg Sci, Infect Dis Unit, Bologna, Italy