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These and previous observations suggest that (1) seasonal fluctuations are greatest when the population frequency is neither very high nor very low, and that (2) the peak season for conception of anencephalic babies may occur in any season except August\u2010November in various populations, whereas for spina bifida seasonal peaks are confined almost exclusively to May\u2013August.<\/jats:p>","DOI":"10.1002\/tera.1420330307","type":"journal-article","created":{"date-parts":[[2005,6,11]],"date-time":"2005-06-11T14:57:38Z","timestamp":1118501858000},"page":"299-303","source":"Crossref","is-referenced-by-count":20,"title":["Seasonal variation of neural tube defects in Newfoundland and elsewhere"],"prefix":"10.1002","volume":"33","author":[{"given":"F. 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