RT Journal Article SR Electronic T1 Diagnosing CF: sweat, blood and years JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 556 OP 557 DO 10.1136/thx.2005.056309 VO 61 IS 7 A1 J S Elborn A1 J M Bradley YR 2006 UL http://thorax.bmj.com/content/61/7/556.abstract AB