title: Transperineal versus transvaginal ultrasonography during the second trimester.
authors.forename: M
authors.initials: M
authors.lastname: Zilianti
mesh_terms: D002584:Cervix Uteri / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D010502:Perineum; D011247:Pregnancy; D011262:Pregnancy Trimester, Second; D014463:Ultrasonography / Q000379:methods*; D014621:Vagina