00473nas a2200205   4500000000100000000000100001008004100002100001400043700001200057700001500069700001400084700001400098700001300112700001300125700001400138245008400152300001000236490000700246022001400253       2010                            d1 aS. Devine1 aS. West1 aE. Andrews1 aP. Tennis1 aT. Hammad1 aS. Eaton1 aJ. Thorp1 aA. Olshan00aThe identification of pregnancies within the general practice research database  a45-500 v19  a1053-8569