No abstract available
MeSH terms
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Bulgaria / epidemiology
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Engineering / statistics & numerical data
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Health Status*
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Hearing Loss, Noise-Induced / epidemiology
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Hearing Loss, Noise-Induced / etiology
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Humans
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Middle Aged
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Noise, Occupational / adverse effects*
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Occupational Diseases / epidemiology
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Occupational Diseases / etiology
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Occupational Exposure / adverse effects*
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Occupational Exposure / statistics & numerical data
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Retrospective Studies
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Risk Factors