RT Journal Article SR Electronic T1 A cloudy pleural effusion JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 658 OP 659 DO 10.1136/thoraxjnl-2011-200859 VO 67 IS 7 A1 Malhotra, Puneet A1 Watson, John P A1 Plant, Paul K A1 Bishop, Richard YR 2012 UL http://thorax.bmj.com/content/67/7/658.abstract AB