Obstetric anesthetic care in the United States.
D000758:Anesthesia; D000773:Anesthesia, Obstetrical / Q000706:statistics & numerical data*; D000777:Anesthetics; D005260:Female; D006801:Humans; D009774:Obstetrics; D011247:Pregnancy; D014481:United States
D000777:Anesthetics
ANESTHESIA, OBSTETRICAL/statistics