No abstract available
MeSH terms
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Adolescent
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Adult
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Aging / immunology
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Albania / ethnology
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Antibodies, Viral / blood*
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Emigration and Immigration* / statistics & numerical data
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Humans
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Immunization / statistics & numerical data
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Italy
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Neutralization Tests / statistics & numerical data
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Poliovirus / immunology*
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Prisoners / statistics & numerical data
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Seroepidemiologic Studies