4BAKACAK M, SERIN S, ERCAN O, et al. Comparison of vitamin d levels in cases with preeclampsia, eclampsia and healthy pregnant women [J]. Int J Clin Exp Med, 2015,8 : 16280-16286.
5SHIBATA M, SUZUKI A, SEKIYA T, et al. High prevalence of hypovitaminosis D in pregnant Japanese with threatened premature delivery [J]. J Bone Miner Metab, 2011,29(5) :615-620.
6TAO M, SHAO H, GU J, et al. Vitamin d status of pregnant women in shanghai, china [J]. J Matern Fetal Neonatal Med, 2012,25 : 237-239.
7XIANG F, JIANG J, LI H, et al. High prevalence of vitamin d insufficiency in pregnant women working indoors and residing in guiyang, china [J]. J Endocrinol Invest, 2013,36 : 503-507.
8SCHOENMAKERS I, PETTIFOR JM, PENA-ROSAS JP, et al. Prevention and consequences of vitamin D deficiency in pregnant and lactating women and children: A symposium to prioritise vitamin D on the global agemla [J]. J Steroid Biochem Mol Biol,2015. doi : 10.1016/j.jsbmb.2015.11.004.