[1]SCHOLL T O,JOHNSON W G.Folic acid:influence on the outcome of pregnancy[J]. Am J Clin Nutr,2000,71 (5 Suppl):1295-1303. [2]ZHANG T, XIN R, GU X, et al.Maternal serum vitamin B12、folate and homocysteine and the risk of neural tube defects in the offspring in a high-risk area of China[J].Public Health Nutr, 2009,12(5):680-686. [3]张晓燕,牛秀敏.同型半胱氨酸与妊娠[J].中华妇产科杂志,2003,38(5):316-317. [4]BERGEN N E,JADDOE V W V,TIMMERMANS S,et al.Homocysteine and folate concentrations in early pregnancy and the risk of adverse pregnancy outcomes: the Generation R Study [J].BJOG, 2012,119(6):739-751. [5]MURPHY M M,FERNANDEZ-BALLART J D.Homocysteine in pregnancy[J].Adv Clin Chem,2011(53):105-137. [6]张蔼,段涛. 叶酸的母胎保护作用[J].中国实用妇科与产科杂志,2013,29(12):993-995. [7]HORTON R. Women's and children's health: no time for complacency[J].Lancet,2012,380(9848):1123-1125. [8]中华人民共和国卫生部.中国出生缺陷防治报告[R].北京:中华人民共和国卫生部,2012:1-16. [9]王敏珍,郑山,白亚娜.人群叶酸服用率及依从性研究进展[J].中华预防医学杂志,2010,44(10):941-943. [10]于海涛,程宁,白亚娜. 叶酸预防神经管畸形服用方法研究进展[J].中华流行病学杂志,2011,32(8):834-836. [11]谢幸,苟文丽.妇产科学[M].8版.北京:人民卫生出版社,2013:451-454. [12]韩志钧,黄志锋,卢业成,等.临床化学常用项目自动分析法[M].3版.沈阳:辽宁科学技术出版社,2005:1043-1049. [13]赵文,李鲁平,黄静.妊娠妇女在不同孕期血清铁蛋白、叶酸和维生素B12检测的临床意义[J].中国妇幼保健,2011,26(29):4639.