00557nas a2200193   4500000000100000000000100001008004100002100001600043700001300059700001300072700001500085700001500100700001600115700001500131245016700146300001000313490000800323022003200331       2002                            d1 aT. McKeever1 aS. Lewis1 aC. Smith1 aJ. Collins1 aH. Heatlie1 aM. Frischer1 aR. Hubbard00aEarly exposure to infections and antibiotics and the incidence of allergic disease: a birth cohort study with the West Midlands General Practice Research Database  a43-500 v109  a0091-6749 (Print) 0091-6749