[1] High Special Cardarelli Hosp, Dept Chest Dis, Div Resp & Allerg Dis, Naples, Italy
[2] Univ Salerno, Dept Med & Surg, Salerno, Italy
[3] High Special Hosp V Monaldi, Div Pneumol 1, Naples, Italy
[4] Univ Federico II, Med Sch Naples, Naples, Italy
[5] High Special Hosp V Monaldi, Div Pneumol 2, Naples, Italy
[6] Univ Hosp Ospedali Riuniti, Serv Immunoallergol, Ancona, Italy