| http://www.w3.org/ns/prov#value | - Data from ???birth ledgers???, essentially a list of all births whether born in hospital or not, but also containing information on mother???s current surname and residential address, and the baby???s sex, date of birth, place of birth and vital status at birth, covering the period 1961???1973 were also included to establish the full denominator for the early period of the study.
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