Changed patterns of obstetric care: "on call" staffing.
D003120:Colorado; D005260:Female; D006801:Humans; D009741:Nursing Staff, Hospital / Q000706:statistics & numerical data*; D009773:Obstetric Nursing; D009774:Obstetrics; D010348:Patient Care Team; D011181:Postnatal Care; D011247:Pregnancy; D011295:Prenatal Care