No abstract available
MeSH terms
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Child, Preschool
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Denmark / epidemiology
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Humans
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Immunization, Secondary*
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Pertussis Vaccine / immunology*
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Vaccines, Acellular / immunology*
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Whooping Cough / epidemiology
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Whooping Cough / prevention & control*
Substances
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Pertussis Vaccine
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Vaccines, Acellular