RT Journal Article SR Electronic T1 Advances in respiratory medicine JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 442 OP 445 DO 10.7861/clinmedicine.7-5-442 VO 7 IS 5 A1 Anne E Tattersfield YR 2007 UL http://www.rcpjournals.org/content/7/5/442.abstract AB