title: A study of parental age effects on the occurrence of fresh mutations for the Apert syndrome.
mesh_terms: D000168:Acrocephalosyndactylia / Q000453:epidemiology / Q000235:genetics*; D000293:Adolescent; D000328:Adult; D000367:Age Factors; D001722:Birth Order; D003398:Craniosynostoses / Q000453:epidemiology / Q000235:genetics*; D005260:Female; D006801:Humans; D008297:Male; D008423:Maternal Age; D008875:Middle Aged; D009154:Mutation; D014481:United States