title: [Ultrasonic examination in early pregnancy. I. Studies in normal pregnancy].
mesh_terms: D000650:Amnion; D005260:Female; D005318:Fetal Heart / Q000254:growth & development; D005333:Fetus; D005865:Gestational Age; D006801:Humans; D008722:Methods; D011247:Pregnancy; D012886:Skull / Q000196:embryology; D014463:Ultrasonography; D014599:Uterus / Q000033:anatomy & histology
vernacular_title: Uber die Bedeutung der Ultraschalluntersuchung in der Frühschwangerschaft. I. Untersuchungen bei normal verlaufenden Schwangerschaften