The incidence of cleft lip and palate among North American Negroes.
D000293:Adolescent; D000328:Adult; D001741:Black or African American; D002971:Cleft Lip / Q000453:epidemiology*; D002972:Cleft Palate / Q000453:epidemiology*; D004219:District of Columbia; D005260:Female; D006801:Humans; D008297:Male