RT Journal Article SR Electronic T1 Spirometric definition of COPD: exercise in futility or factual debate? JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 569 OP 570 DO 10.1136/thoraxjnl-2012-201720 VO 67 IS 7 A1 Vito Brusasco YR 2012 UL http://thorax.bmj.com/content/67/7/569.abstract AB