[Survey of congenital heart disease in children in the Qinghai Plateau].
D000293:Adolescent; D000531:Altitude; D002648:Child; D002675:Child, Preschool; D002681:China; D006330:Heart Defects, Congenital / Q000453:epidemiology* / Q000209:etiology; D006801:Humans; D012737:Sex Factors