title: Placental migration demonstrated by ultrasonography. A hypothesis of dynamic placentation.
mesh_terms: D002584:Cervix Uteri; D005260:Female; D005500:Follow-Up Studies; D008722:Methods; D010922:Placenta Diseases / Q000175:diagnosis*; D010923:Placenta Previa / Q000175:diagnosis*; D011247:Pregnancy; D013314:Stress, Mechanical; D014463:Ultrasonography; D001743:Urinary Bladder; D014599:Uterus / Q000502:physiology