Prevalence and Associated Factors of Periconceptional Folic Acid Supplementation in Yunnan Women of Childbearing Age　
WU Yu，YUAN Yanling，KONG Cai，MA Qiuyue，JING Wenzhan，YE Hanfeng，LIU Jue，LIU Min
Chinese General Practice . 2021, (25): 3221 -3226 .  DOI: 10.12114/j.issn.1007-9572.2021.00.243

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