No abstract available
MeSH terms
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Adolescent
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Adult
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Child
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Child, Preschool
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Coronary Disease / epidemiology*
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Coronary Disease / therapy
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Czechoslovakia
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Humans
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Infant
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Infant, Newborn
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Middle Aged
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Nasopharyngeal Diseases / epidemiology*
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Nasopharyngeal Diseases / therapy
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Spinal Diseases / epidemiology*
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Spinal Diseases / therapy