Prevalence of Ectopic Pregnancy in Hebei Province during the Implementation of Universal Two-child Policy：a Multicenter Study　
ZHANG Huanhuan，GUO Yanwei，ZHANG Jinhuan，YANG Jiaqi，SHAN Weiying
Chinese General Practice . 2021, (8): 1017 -1021 .  DOI: 10.12114/j.issn.1007-9572.2020.00.330

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