RT Journal Article SR Electronic T1 Treating sleep apnoea is cost effective JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 93 OP 93 DO 10.1136/thorax.57.1.93 VO 57 IS 1 A1 N J Douglas A1 C F P George YR 2002 UL http://thorax.bmj.com/content/57/1/93.1.abstract AB