RT Journal Article SR Electronic T1 Non-invasive ventilation in acute respiratory failure JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 192 OP 211 DO 10.1136/thorax.57.3.192 VO 57 IS 3 YR 2002 UL http://thorax.bmj.com/content/57/3/192.abstract AB