Secular trends of the number and sex ratio of live births in Hebei Province since the implementation of two-child policy

YANG Rongshan, ZHANG Yingkui, LI Jinhua, FAN Songli, DU Liyan,ZUO Lihong

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Chinese Journal of Reproductive Health ›› 2019, Vol. 30 ›› Issue (5) : 407-410.

Secular trends of the number and sex ratio of live births in Hebei Province since the implementation of two-child policy

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{{article.zuoZheEn_L}}. {{article.title_en}}[J]. {{journal.qiKanMingCheng_EN}}, 2019, 30(5): 407-410

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