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Correlation matrix of all the predictor variables tested in the multivariable survival modeling. Tests were non-parametric Spearman rank tests, with color-encoding of the Spearman rho value between −1 (blue, perfect negative correlation) to +1 (red, perfect positive correlation). Significance of the correlation tests is encoded as follows: *: p < 0.05, **: p < 0.005, ***: p < 0.001.
