题名 | Embryonic heart rate as a predictor of first-trimester pregnancy loss in infertility patients after in vitro fertilization. |
链接 | http://www.ncbi.nlm.nih.gov/pubmed/?term=Embryonic+heart+rate+as+a+predictor+of+first-trimester+pregnancy+loss+in+infertility+patients+after+in+vitro+fertilization. |
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