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Figure 1 Urinary and plasma logarithm of NT‐proBNP levels during a 24‐month follow‐up. Measurements represent the mean at basal (1), stage I (2) and stage II (3). NT‐proBNP, N‐terminal pro‐brain natriuretic peptide levels; stage I, 12‐month follow‐up; stage II, 24‐month follow‐up. **p<0.01 with respect to basal levels.
