[1] Univ Arizona, Banner Univ Med Ctr, Lung Inst, 755 E McDowell Rd,3rd Floor, Phoenix, AZ 85006 USA
[2] Federico II Univ Naples, Dept Resp Dis, Naples, Italy
[3] Univ Calif Los Angeles, David Geffen Sch Med, Pulm & Crit Care Med, 10833 Le Conte Ave,Room 37-131 CHS,Box 951690, Los Angeles, CA 90095 USA
[4] Via S Giacomo Capri 65, I-80131 Naples, Italy