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Seasonal variation in the frequency of anencephalus and spina bifida births in the United Kingdom.
  1. M H Maclean,
  2. A MacLeod


    There have been statistically significant seasonal variations of annencephalus and spina bifida in each country of the United Kingdom during 1964-79 with the exception of anencephalus births in Northern Ireland. The seasonal peaks, where discernible, are in phase. Embryos appear to develop anencephalus most commonly in May-June and spina bifida in July.

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