RT Journal Article SR Electronic T1 Polyunsaturated fats and asthma JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 93 OP 94 DO 10.1136/thorax.57.1.93-a VO 57 IS 1 A1 A S Truswell YR 2002 UL http://thorax.bmj.com/content/57/1/93.2.abstract AB