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Editorial
Does exposure to coal dust prevent or cause lung cancer?

https://doi.org/10.1136/oem.2009.048223

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    Footnotes

    • Competing interests None.

    • Provenance and peer review Commissioned; not externally peer reviewed.

    • ↵i Note these authors used the convention of multiplying the ratio of the observed to expected number of deaths by 100. This convention will be used consistently in this editorial.