[Introduction of diagnostic ultrasound].
D005260:Female; D005313:Fetal Death; D005315:Fetal Diseases / Q000175:diagnosis*; D006801:Humans; D010923:Placenta Previa / Q000175:diagnosis; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis*; D011296:Prenatal Diagnosis; D014463:Ultrasonography