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Table 1 Relative risk (RR) for the use of C1 coal

From: Nanoquartz in Late Permian C1 coal and the high incidence of female lung cancer in the Pearl River Origin area: a retrospective cohort study

Expected RR

Required person-years

1.5

466,000

2.0

134,000

3.0

42,000

5.0

15,000

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BMC Public Health

ISSN: 1471-2458

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