Recently,with the improvemnent of eugenics consciousness and wide use of ultrasound scan,more and more anembryonic pregnancies have been found.Many pregnant women and their family were burdened with anembryonic pregnancy.
There are some issues in studies about anembryonic pregnancy:first,the objects of many studies were consisted of women with anembryonic pregnancy and dead embryo pregnancy,which caused diagnosis bias.Second,there are few studies on the association of nutrients status of pregnan...
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