Use of combined oral contraceptives and risk of venous thromboembolism: nested case-control studies using the QResearch and CPRD databases

@inproceedings{Vinogradova2015UseOC,
  title={Use of combined oral contraceptives and risk of venous thromboembolism: nested case-control studies using the QResearch and CPRD databases},
  author={Yana Vinogradova and Carol Coupland and Julia Hippisley-Cox},
  booktitle={BMJ},
  year={2015}
}
OBJECTIVE To investigate the association between use of combined oral contraceptives and risk of venous thromboembolism, taking the type of progestogen into account. DESIGN Two nested case-control studies. SETTING General practices in the United Kingdom contributing to the Clinical Practice Research Datalink (CPRD; 618 practices) and QResearch primary care database (722 practices). PARTICIPANTS Women aged 15-49 years with a first diagnosis of venous thromboembolism in 2001-13, each… CONTINUE READING

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