RT Journal Article SR Electronic T1 Oilseed rape and asthma JF The Journal of the Royal College of General Practitioners JO J R Coll Gen Pract FD British Journal of General Practice SP 168 OP 168 VO 39 IS 321 A1 T.C. Mayer YR 1989 UL http://bjgp.org/content/39/321/168.1.abstract AB