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2. Incidence of anencephalus, spina bifida, and hydrocephalus related to birth, rank and maternal age;Ingalls;Br J Prev Soc Med,1954
3. Congenital malformation of the central nervous system in Scotland;Edwards;Br J Prev Soc Med,1958
4. Anencephalus in Scotland;Record;Br J Prev Soc Med,1961
5. Paternal age and malformations;Milham;Human Biology,1965