The high frequency of juvenile Huntington's chorea in South Africa.
D000293:Adolescent; D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D005006:Ethnicity; D005260:Female; D005787:Gene Frequency; D006801:Humans; D006816:Huntington Disease / Q000453:epidemiology* / Q000235:genetics; D008297:Male; D013019:South Africa