The placenta.
D000037:Abruptio Placentae / Q000175:diagnosis; D005260:Female; D005325:Fetal Organ Maturity; D005330:Fetofetal Transfusion / Q000175:diagnosis; D005865:Gestational Age; D006801:Humans; D008168:Lung / Q000196:embryology; D010920:Placenta / Q000033:anatomy & histology*; D010923:Placenta Previa / Q000175:diagnosis; D011247:Pregnancy; D011248:Pregnancy Complications / Q000175:diagnosis*; D011272:Pregnancy, Multiple; D012306:Risk; D014463:Ultrasonography