RT Journal Article SR Electronic T1 Smoking, cadmium, and emphysema JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 184 OP 185 DO 10.1136/thx.2003.018432 VO 59 IS 3 A1 D J Hendrick YR 2004 UL http://thorax.bmj.com/content/59/3/184.abstract AB