Association between markers of emphysema and more severe chronic obstructive pulmonary disease
P Boschetto, S Quintavalle, E Zeni, S Leprotti, A Potena, L Ballerin, A Papi, G Palladini, M Luisetti, L Annovazzi, P Iadarola, E De Rosa, L M Fabbri, C E Mapp
Thorax Dec 2006, 61 (12) 1037-1042; DOI: 10.1136/thx.2006.058321