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Dose-response curves for intakes of (a) dietary iron; (b) total iron; and (c) heme iron in relation to breast cancer risk. Data were modeled using random-effects restricted cubic spline models with three knots fixed at the 10th, 50th, and 90th percentiles. The solid lines represent the fitted relative risks for the nonlinear trend, and the dashed lines represent pointwise 95% confidence intervals
