00577nas a2200217   4500000000100000000000100001008004100002653002700043653001400070653001700084100001600101700001600117700001500133700001500148700001600163700001200179700001600191245012300207250001500330020001400345       2022                            d10aElectronic Health Data10aPregnancy10aprimary care1 aJ. Campbell1 aH. Shepherd1 aS. Welburn1 aR. Barnett1 aJ. Oyinlola1 aN. Oues1 aR. Williams00aMethods to refine and extend a Pregnancy Register in the UK Clinical Practice Research Datalink primary care databases  a2022/12/17  a1053-8569