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The lack of data on the relation between use of hormone replacement therapy (HRT) and risk of venous thromboembolism (VTE) prompted us to undertake a hospital-based case-control study to address this question.1 In addition, we performed a small case-control study nested within the Oxford Family Planning Association (Oxford FPA) contraceptive study to provide additional data which are reported here.
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Daly et al. (1996) studied this question.
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