[1] Pisa Univ Hosp, Otolaryngol Audiol & Phoniatr Operat Unit, Dept Surg Med Mol Pathol & Crit Care Med, I-56124 Pisa, Italy
[2] AO Colli, Osped Monaldi, UOSD Malattie Resp Federico II, I-80131 Naples, Italy
[3] Univ Foggia Univ Hosp, Dept Med & Surg Sci, Policlin Riuniti Foggia, I-71122 Foggia, Italy
[4] Univ Genoa, Dept Internal Med DIMI, IRCCS Policlin San Martino, Allergy & Resp Dis, I-16132 Genoa, Italy
[5] Univ Milan, Dept Hlth Sci, Pneumol, ASST Papa Giovanni XXIII, I-24127 Bergamo, Italy
[6] Univ Turin, San Luigi Gonzaga Hosp, Dept Otolaryngol, I-10043 Orbassano, Italy
[7] Osped S Valentino AULSS 2 Marca Trevigiana, UOC Pneumol, I-31044 Montebelluna, Italy
[8] AUSL, ENT Div Bellaria Hosp, I-40139 Bologna, Italy
[9] Magna Graecia Univ Catanzaro, Dipartimento Sci Salute, I-88100 Catanzaro, Italy
[10] AORN Osped Colli, Otolaryngol Head & Neck Surg Unit, I-80131 Naples, Italy
[11] Univ Cattolica Sacro Cuore, Dept Otolaryngol Head & Neck Surg, Fdn Policlin Univ A Gemelli IRCSS, I-00168 Rome, Italy
[12] Univ Cattolica Sacro Cuore, Dept Cardiovasc & Thorac Sci, I-00168 Rome, Italy
[13] Fdn Policlin Univ Agostino Gemelli IRCCS, Dept Clin & Surg Sci, I-00168 Rome, Italy
[14] Imperial Coll London, Natl Heart & Lung Inst NHLI, London SW3 6LY, England