A study of time-place clustering in anencephaly and spina bifida.
D000757:Anencephaly / Q000453:epidemiology*; D005260:Female; D005843:Geography; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D010290:Parents; D011247:Pregnancy; D011336:Probability; D012111:Residence Characteristics; D012189:Retrospective Studies; D012237:Rhode Island; D016135:Spinal Dysraphism / Q000453:epidemiology*; D013997:Time Factors