RT Journal Article SR Electronic T1 Should we be using statistics to define disease? JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 1031 OP 1032 DO 10.1136/thx.2008.100081 VO 63 IS 12 A1 David M Mannino YR 2008 UL http://thorax.bmj.com/content/63/12/1031.abstract AB