RT Journal Article SR Electronic T1 Unfolding the mechanisms of progression of pulmonary emphysema in COPD JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 801 OP 803 DO 10.1183/09031936.00030112 VO 40 IS 4 A1 Riccardo Pellegrino A1 Andrea Antonelli YR 2012 UL http://erj.ersjournals.com/content/40/4/801.abstract AB