title: Neural tube defects in Quebec. A search for evidence of 'clustering' in time and place.
mesh_terms: D000757:Anencephaly / Q000453:epidemiology* / Q000209:etiology; D004812:Epidemiologic Methods; D006801:Humans; D011792:Quebec; D016135:Spinal Dysraphism / Q000453:epidemiology* / Q000209:etiology