00493nas a2200157   4500000000100000000000100001008004100002100001600043700001800059700001600077700001200093245018100105300001000286490000700296022003200303       2008                            d1 aR. Charlton1 aM. Cunnington1 aC. de Vries1 aJ. Weil00aData resources for investigating drug exposure during pregnancy and associated outcomes: the General Practice Research Database (GPRD) as an alternative to pregnancy registries  a39-510 v31  a0114-5916 (Print) 0114-5916