RT Journal Article SR Electronic T1 Airway clearance research in CF: the ‘perfect storm’ of strong preference and effortful participation in long-term, non-blinded studies JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 701 OP 702 DO 10.1136/thoraxjnl-2012-203054 VO 68 IS 8 A1 Eleanor Main YR 2013 UL http://thorax.bmj.com/content/68/8/701.abstract AB