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Chinese Journal of Family Planning
Analysis on the pregnancy age trend of primiparas with planning pregnancy in rural areas in Minle county of Gansu province from 2013 to 2019
SHI Shengzhen1, HAN Chunying2, MU Rongwei2, ZENG Shuai2, WANG Long2, YANG Ying3, MA Xu3
中国计划生育学杂志 . 2021, (2): 226 .