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Age-period-cohort (APC) trend analysis for hepatocellular (HCC) and cholangiocarcinoma (CCA) cancers by gender; (a) CCA-male, (b) CCA-female, (c) HCC-male, and (d) HCC-female. For each group, the models with the lowest AIC value presented in Table 3 are drawn over the ones with higher AIC value. The thin lines above and below the three effects represent their 95% confidence interval.
