title: Anencephaly, spina bifida and dizygotic twinning: a review of the data of Stevenson et al.
mesh_terms: D000757:Anencephaly / Q000453:epidemiology / Q000235:genetics*; D004200:Diseases in Twins; D004534:Egypt; D006760:Hospitalization; D006801:Humans; D007494:Ireland; D016135:Spinal Dysraphism / Q000453:epidemiology / Q000235:genetics*; D013223:Statistics as Topic