评价服药者和不服药者及不同类型，不同剂量，不同代复方口服避孕药的心肌梗死和缺血性脑梗死的风险。
To estimate the risk of myocardial infarction or ischemic stroke in users compared with non-users of different types, doses and generations of combined oral contraception.
评价服药者和不服药者及不同类型，不同剂量，不同代复方口服避孕药的心肌梗死和缺血性脑梗死的风险。
To estimate the risk of myocardial infarction or ischemic stroke in users compared with non-users of different types, doses and generations of combined oral contraception.
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