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妊娠中・後期の超音波診断 Ultrasound examination in the second and third trimester Hata, Kohkichi 秦, 幸吉 ハタ, コウキチ 超音波診断 妊娠中期 妊娠後期 ultrasound examination second trimester third trimester journal article 香川産科婦人科学会 2012-09-01 VoR 香川産科婦人科雑誌 1 14 1 8 Kagawa journal of obstetrics and gynecology : official journal of the Kagawa Society of Obstetrics and Gynecology 2185-1409 https://kagawa-u.repo.nii.ac.jp/records/2000447 jpn 40019490915 https://www.med.kagawa-u.ac.jp/~perigyne/ksog/journal/pdf/bukai14.pdf open access