title: A study of etiological variables in palatolabial malformations.
mesh_terms: D001722:Birth Order; D002971:Cleft Lip / Q000209:etiology*; D002972:Cleft Palate / Q000209:etiology*; D005260:Female; D006801:Humans; D008297:Male; D008423:Maternal Age; D044469:Racial Groups; D012737:Sex Factors