This prospective study included pregnant women registered in health stations in randomly-selected communes in Ha Nam province.
这项前瞻性研究包括了在哈南省随机选择的社区卫生站中登记的孕妇。
This prospective study included pregnant women registered in health stations in randomly-selected communes in Ha Nam province.
这项前瞻性研究包括了在哈南省随机选择的社区卫生站中登记的孕妇。
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