RT Journal Article SR Electronic T1 Early diagnosis of COPD JF British Journal of General Practice JO Br J Gen Pract FD British Journal of General Practice SP 969 OP 969 VO 56 IS 533 A1 Nigel Masters A1 Catherine Tutt A1 Jenny Eades YR 2006 UL http://bjgp.org/content/56/533/969.2.abstract AB