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Embryos appear to develop anencephalus most commonly in May-June and spina bifida in July.<\/jats:p>","DOI":"10.1136\/jech.38.2.99","type":"journal-article","created":{"date-parts":[[2008,11,12]],"date-time":"2008-11-12T15:09:01Z","timestamp":1226502541000},"page":"99-102","source":"Crossref","is-referenced-by-count":16,"title":["Seasonal variation in the frequency of anencephalus and spina bifida births in the United Kingdom."],"prefix":"10.1136","volume":"38","author":[{"given":"M H","family":"Maclean","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"A","family":"MacLeod","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[1984,6,1]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"158","DOI":"10.1093\/oxfordjournals.bmb.a071187","article-title":"Causation of neural tube defects: clues from epidemiology","volume":"30","author":"Leck, I.","year":"1974","unstructured":"Leck I. 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