RT Journal Article SR Electronic T1 Non-invasive monitoring of CO2 levels in patients using NIV for AECOPD JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 363 OP 364 DO 10.1136/thx.2005.051664 VO 61 IS 4 A1 Cox, M A1 Kemp, R A1 Anwar, S A1 Athey, V A1 Aung, T A1 Moloney, E D YR 2006 UL http://thorax.bmj.com/content/61/4/363.abstract AB