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研究目的:本研究在荷兰地区评估了复方口服避孕药所含的雌激素剂量以及孕激素类型与发生血栓风险的关系。该研究为基于人群的病例对照分析。
Research purposes: This study evaluated the dose of estrogen and the relationship between the type of progestin and the risk of thromboembolism in compound oral contraceptives in the Netherlands. This study is a population-based case-control analysis.