β-hCG比值联合子宫内膜厚度预测早期不明位置妊娠者异位妊娠的临床价值
β-hCG비치연합자궁내막후도예측조기불명위치임신자이위임신적림상개치
Prediction of ectopic pregnancy in early pregnancy of unknown location with β-hCG ratio combined endometrial thickness
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