We know how many--but how?
Stephen P
SP
Sanders
D000328:Adult; D002309:Cardiology / Q000193:education*; D002648:Child; D015897:Comorbidity; D006330:Heart Defects, Congenital / Q000453:epidemiology* / Q000628:therapy; D006801:Humans; D010372:Pediatrics / Q000193:education; D015995:Prevalence; D014481:United States / Q000453:epidemiology