RT Journal Article SR Electronic T1 Physical activity and COPD development. Time to advocate JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 831 OP 832 DO 10.1136/thoraxjnl-2019-213549 VO 74 IS 9 A1 Judith Garcia Aymerich YR 2019 UL http://thorax.bmj.com/content/74/9/831.abstract AB