[Embryologico-echographic correlates in the 1st trimester of pregnancy].
D005314:Embryonic and Fetal Development; D005260:Female; D005865:Gestational Age; D006801:Humans; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D014463:Ultrasonography
Correlación embriológico-ecográfica del primer trimestre de la gestación.