title: Cleft lip and palate: variability in the Czech population, sex ratio and familial incidence.
mesh_terms: D002971:Cleft Lip / Q000453:epidemiology* / Q000235:genetics; D002972:Cleft Palate / Q000453:epidemiology* / Q000235:genetics; D003604:Czechoslovakia; D005260:Female; D006801:Humans; D008297:Male; D012737:Sex Factors