title: Ultrasonic placental grading and fetal pulmonary maturity.
mesh_terms: D000328:Adult; D000653:Amniotic Fluid / Q000032:analysis; D005260:Female; D005325:Fetal Organ Maturity; D006801:Humans; D008168:Lung / Q000196:embryology; D010743:Phospholipids / Q000032:analysis; D010920:Placenta; D011247:Pregnancy; D014463:Ultrasonography
chemical_list: D010743:Phospholipids