RT Journal Article SR Electronic T1 Survey of the use of non-invasive positive pressure ventilation in UK and Australasian children with cystic fibrosis JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 538 OP 539 DO 10.1136/thx.2010.139063 VO 66 IS 6 A1 N Collins A1 A Gupta A1 S Wright A1 L Gauld A1 D Urquhart A1 A Bush YR 2011 UL http://thorax.bmj.com/content/66/6/538.abstract AB