No abstract available
MeSH terms
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Case-Control Studies
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Colonic Polyps / diagnosis
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Colonic Polyps / epidemiology
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Colonic Polyps / etiology
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Colorectal Neoplasms / diagnosis
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Colorectal Neoplasms / epidemiology
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Colorectal Neoplasms / etiology
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Diagnosis, Differential
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Environmental Exposure / standards*
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Environmental Monitoring / standards
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Epidemiologic Methods
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Epidemiological Monitoring
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Epidemiology / standards*
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Humans
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Mass Screening / standards*
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Research Design / standards
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Risk Assessment
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Smoking / adverse effects
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Tobacco Smoke Pollution