No abstract available
MeSH terms
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Black People / statistics & numerical data*
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Carcinoma, Squamous Cell / epidemiology*
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Causality
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Comorbidity
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Endemic Diseases / statistics & numerical data
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Esophageal Neoplasms / epidemiology*
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Humans
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Incidence
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Nicotiana / poisoning*
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Smoking / ethnology*
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South Africa / epidemiology