No abstract available
MeSH terms
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Animals
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Breast Feeding
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Child, Preschool
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Drinking
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Environmental Exposure
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Environmental Health
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Focal Infection / epidemiology
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Geography
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Humans
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Hygiene
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Hypersensitivity / epidemiology
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Infant
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Infant Nutritional Physiological Phenomena
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Infant, Newborn
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Milk
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Multiple Sclerosis / epidemiology*
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Nervous System Diseases / epidemiology
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Poland
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Virus Diseases / epidemiology
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Water