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Receiver operating characteristic curves showing predictive value of smoking, self‐reported diseases, symptoms, and signs + N‐terminal pro‐brain natriuretic peptide (NT‐proBNP) for heart failure, n = 1381, and chronic obstructive pulmonary disease (COPD), n = 1370. AUC, area under the curve; CI, confidence interval; mMRC, modified Medical Research Council.
