title: Empirical recurrence risks in facial clefts.
mesh_terms: D002648:Child; D002971:Cleft Lip / Q000453:epidemiology / Q000235:genetics*; D002972:Cleft Palate / Q000453:epidemiology / Q000235:genetics*; D003604:Czechoslovakia; D005787:Gene Frequency; D006801:Humans; D007231:Infant, Newborn