经腹部超声与经阴道超声诊断孕11~14周胎儿畸形的对比研究
경복부초성여경음도초성진단잉11~14주태인기형적대비연구
A comparative study between transabdominal ultrasound and transvaginal ultrasound in the diagnosis of fetal structural abnormalities at the 11~14 week of gestation
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