Studies in spina bifida cystica. III. Seasonal variation in the frequency of spina bifida births.
GUTHKELCH
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D002980:Climate; D005260:Female; D006801:Humans; D036801:Parturition; D010507:Periodicity; D012621:Seasons; D016137:Spina Bifida Cystica; D016135:Spinal Dysraphism
PERIODICITY