Regionalizing perinatal health services in Massachusetts.
D001723:Birth Rate; D002662:Child Health Services / Q000592:standards* / Q000706:statistics & numerical data; D006801:Humans; D007231:Infant, Newborn; D007362:Intensive Care Units / Q000706:statistics & numerical data; D008404:Massachusetts; D008427:Maternal Health Services / Q000592:standards* / Q000706:statistics & numerical data; D009725:Nurseries, Hospital / Q000706:statistics & numerical data; D011295:Prenatal Care / Q000592:standards; D012017:Referral and Consultation; D012041:Regional Medical Programs