RT Journal Article SR Electronic T1 Authors’ response ARTICLE JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 936 OP 937 VO 63 IS 10 A1 A Smyth A1 C Bertenshaw A1 S Lewis A1 I Choonara A1 A Watson YR 2008 UL http://thorax.bmj.com/content/63/10/936.2.abstract AB