title: Endovaginal ultrasonographic measurement of early embryonic size.
authors.forename: H C
authors.initials: HC
authors.lastname: Yeh
authors.forename: J G
authors.initials: JG
authors.lastname: Rabinowitz
mesh_terms: D000328:Adult; D000886:Anthropometry; D018568:Crown-Rump Length; D004622:Embryo, Mammalian / Q000000981:diagnostic imaging* / Q000502:physiology; D005314:Embryonic and Fetal Development / Q000502:physiology; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D016216:Ultrasonography, Prenatal / Q000379:methods*; D014621:Vagina