Cardiovascular disease is a major cause of maternal mortality, but the extent to which infertility treatment is implicated in heart disease remains unclear.

中文翻译：

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不孕症治疗与产后因心脏病住院的风险增加有关

心血管疾病是孕产妇死亡的主要原因，但不孕治疗与心脏病的关联程度仍不清楚。