RT Journal Article SR Electronic T1 Lessons to be learnt from unsuccessful clinical trials JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 459 OP 460 DO 10.1136/thx.2011.161091 VO 66 IS 6 A1 Smyth, Rosalind L YR 2011 UL http://thorax.bmj.com/content/66/6/459.abstract AB