Regionalization of perinatal care.
D005260:Female; D006801:Humans; D007231:Infant, Newborn; D010500:Perinatology / Q000193:education; D011247:Pregnancy; D011295:Prenatal Care / Q000458:organization & administration*; D012041:Regional Medical Programs / Q000458:organization & administration*; D014481:United States; D000078329:Workforce