[The fetal electrocardiogram and the placental index].
D001724:Birth Weight; D004562:Electrocardiography; D005260:Female; D005318:Fetal Heart / Q000502:physiology*; D005865:Gestational Age; D006801:Humans; D009929:Organ Size; D010920:Placenta / Q000033:anatomy & histology*; D011247:Pregnancy