Characteristics of the sex ratio at birth in Chaoyang, Beijing from 2009 to 2019
LYU Xilin, TANG Youchi, ZHOU Yubo, LI Hongtian, LIU Jianmeng
Chinese Journal of Reproductive Health ›› 2023, Vol. 34 ›› Issue (2) : 114-119.
Characteristics of the sex ratio at birth in Chaoyang, Beijing from 2009 to 2019
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