The Tucson nurse-midwifery service: the first four years.
D001130:Arizona; D005260:Female; D006268:Health Facilities / Q000706:statistics & numerical data*; D006801:Humans; D007231:Infant, Newborn; D008430:Maternal-Child Health Centers / Q000706:statistics & numerical data*; D009721:Nurse Midwives; D007744:Obstetric Labor Complications / Q000453:epidemiology; D011247:Pregnancy; D011248:Pregnancy Complications / Q000453:epidemiology