title: Early diagnosis and follow up of twin-pregnancy using a two-dimensional ultrasonic scanner.
mesh_terms: D005260:Female; D006801:Humans; D011247:Pregnancy; D011258:Pregnancy Tests / Q000295:instrumentation*; D011272:Pregnancy, Multiple; D011295:Prenatal Care / Q000379:methods*; D014427:Twins; D014463:Ultrasonography