No abstract available
MeSH terms
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Child
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Female
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Follow-Up Studies
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Fresh Water
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Gastric Acidity Determination
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Gastric Mucosa / metabolism*
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Gastrointestinal Diseases / physiopathology
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Gastrointestinal Diseases / therapy
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Gastroscopy
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Health Resorts*
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Humans
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Male
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Siberia
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Time Factors