RT Journal Article SR Electronic T1 Are clinical risk scores for COPD useful? JF BMJ Open Respiratory Research JO BMJ Open Resp Res FD British Thoracic Society SP e000072 DO 10.1136/bmjresp-2014-000072 VO 2 IS 1 A1 Jennifer K Quint YR 2015 UL http://bmjopenrespres.bmj.com/content/2/1/e000072.abstract AB