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. 2009 Nov 18;118(4):526–532. doi: 10.1289/ehp.0901127

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Four different scenarios for the shape of the benzene–leukemia ERC: Natural spline with intercept fitted to all studies (best-fitting model) (A), natural spline without intercept fitted to all studies (B), natural spline with intercept fitted to the cohort studies (C), and linear model without intercept (D) fitted to all the studies (1) and only the cohort studies (2). Dashed lines are 95% CIs.