[1] Univ Hosp Modena, Resp Dis Unit, Modena, Italy
[2] Univ Hosp Modena, Ctr Rare Lung Dis, Modena, Italy
[3] Univ Modena Reggio Emilia Modena I, Modena, Italy
[4] Univ Modena Reggio Emilia Modena I, Sch Med, Modena, Italy
[5] Hosp Mantova, Resp Dis Unit, Mantua, Italy
[6] Univ Bologna, Dept Specialist Diagnost & Expt Med DIMES, Bologna, Italy