No abstract available
MeSH terms
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Adolescent
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Age Factors
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Child
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Child, Preschool
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Ear Diseases / epidemiology
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Female
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Humans
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Infant
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Male
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Nose Diseases / epidemiology
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Otorhinolaryngologic Diseases / epidemiology*
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Pharyngeal Diseases / epidemiology
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Russia
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Sex Factors