RT Journal Article SR Electronic T1 Transudates and exudates JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 657 OP 657 DO 10.1136/thorax.57.7.657-a VO 57 IS 7 A1 Quantrill, S J A1 Dabal, L YR 2002 UL http://thorax.bmj.com/content/57/7/657.2.abstract AB