Impact of specialty centres on neonatal heart disease, Ontario, 1975.
D002300:Cardiac Care Facilities / Q000706:statistics & numerical data*; D002662:Child Health Services / Q000706:statistics & numerical data*; D006330:Heart Defects, Congenital / Q000453:epidemiology; D006782:Hospitals, Special / Q000706:statistics & numerical data*; D006801:Humans; D007231:Infant, Newborn; D009864:Ontario; D012017:Referral and Consultation