No abstract available
MeSH terms
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Adult
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Carcinoma, Squamous Cell / chemically induced
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Carcinoma, Squamous Cell / epidemiology
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Humans
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Lung Neoplasms / chemically induced*
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Lung Neoplasms / epidemiology
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Male
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Mass Screening
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Metallurgy*
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Middle Aged
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Nickel / toxicity*
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Occupational Diseases / chemically induced*
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Occupational Diseases / epidemiology
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Ontario
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Smoking
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Sputum / cytology*