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Changes of NT-proBNP, E/e' levels and e' levels in HFREF and normal group at baseline, the 6th month, and the 12th month. (a) NT-proBNP levels. (b) E/e′ levels. (c) e′ levels. Values are given in the form of mean ± SD. ∗∗∗P < 0.001 versus the baseline group.
