RT Journal Article SR Electronic T1 Which COPD patients should be admitted to the ICU? JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 735 OP 735 VO 64 IS 8 A1 Subbe, C YR 2009 UL http://thorax.bmj.com/content/64/8/735.abstract AB