[1] Sapienza Univ Rome, Dept Publ Hlth & Infect Dis, I-00185 Rome, Italy
[2] Imperial Coll London, Royal Brompton Hosp, Airways Div, London, England
[3] Sapienza Univ Rome, Dept Radiol Oncol & Pathol Sci, Rome, Italy
[4] Sapienza Univ Rome, Dept Mol Med, Rome, Italy