RT Journal Article SR Electronic T1 Computed tomography and monitoring of emphysema JF European Respiratory Journal JO Eur Respir J FD European Respiratory Society SP 1075 OP 1077 DO 10.1183/09031936.00039807 VO 29 IS 6 A1 H. O. Coxson YR 2007 UL http://erj.ersjournals.com/content/29/6/1075.abstract AB