No abstract available
MeSH terms
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Child
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England
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Epidemiologic Methods
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History of Medicine
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Humans
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Judgment*
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Poliovirus Vaccine, Inactivated / history
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Statistics as Topic
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Typhoid-Paratyphoid Vaccines / history
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United States
Substances
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Poliovirus Vaccine, Inactivated
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Typhoid-Paratyphoid Vaccines