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Correlation coefficients of the models: diamonds: R 2; triangles: R 0 2; dash lines: mean values. (a) Lung cancer cases, with mean value of 0.94 for R 2 and 0.63 for R 0 2, respectively; (b) cervical cancer cases, with mean value of 0.93 for R 2 and 0.87 for R 0 2, respectively.
