the increased risk of lung cancer among male workers with 20 or more years since first employment , which was not significantly in excess of 1.0 , although still compatible with a two- to threefold increase according to conventional 95 % confidence limits , could not be explained by deviations in local lung cancer incidence , place of residence among the rock-wool male workers , or smoking habits prevailing among unskilled workers in the eastern part of denmark .
C0242379
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C0024109
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