[1] AOU Policlin Vittorio Emanuele, Resp Med Unit, Catania, Italy
[2] AOU Policin G Martino, Anesthesia & Intens Care Unit, Messina, Italy
[3] Univ Foggia, Inst Resp Dis, Dept Med & Surg Sci, Foggia, Italy
[4] Ctr Individuato ASMA GRAVE, Ctr Riferimento Aziendale Terr Prevenz Malattie A, Palermo, Italy
[5] Magna Graecia Univ Catanzaro, Dept Med & Surg Sci, Catanzaro, Italy
[6] Univ Messina, Sch & Div Allergy & Clin Immunol, Dept Human Pathol, Messina, Italy
[7] Univ Palermo, Sez Pneumol, Dipartimento Biomed Med Interna & Specialist DIBI, Palermo, Italy
[8] Univ Catania, Resp Med Unit, Dept Clin & Expt Med, AOU Policlin Vittorio Emanuele, Catania, Italy