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The legend to figure 2 should read: "Upper panel: distribution of patients across range of 4C Mortality Score in validation cohort; middle panel: observed in-hospital mortality across range of 4C Mortality Score in validation cohort; lower panel: predicted versus observed probability of in-hospital mortality (calibration; red line) for 4C Mortality Score within the validation cohort."
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British Medical Journal Publishing Group (2020) studied this question.
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