RT Journal Article SR Electronic T1 Pleural effusions JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 207 OP 210 DO 10.7861/clinmedicine.4-3-207 VO 4 IS 3 A2 Mark Woodhead A1 Stephen J Chapman A1 Robert JO Davies YR 2004 UL http://www.rcpjournals.org/content/4/3/207.abstract AB