00461nas a2200157   4500000000100000000000100001008004100002100001600043700001300059700001300072700001500085245015200100300001100252490000800263022003200271       2002                            d1 aT. McKeever1 aS. Lewis1 aC. Smith1 aR. Hubbard00aThe importance of prenatal exposures on the development of allergic disease: a birth cohort study using the West Midlands General Practice Database  a827-320 v166  a1073-449X (Print) 1073-449x