正常妊娠妇女孕4~7周孕囊大小、血β-hCG水平与孕龄的关系
정상임신부녀잉4~7주잉낭대소、혈β-hCG수평여잉령적관계
Relationship Between the Pregnancy Sac Size, Blood β-hCG Level and Gestational Age of Women with 4 to 7 Gestational Weeks
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