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(A–D) The relationship between the number of cigarettes smoked per day and LF/HF ratio 24 hours (A), SDNN (B), and NT‐pro‐BNP (C). The correlation between LH/HF ratio 24 hours and NT‐pro‐BNP levels (D). SDNN = standard deviation of all NN intervals; LF = low frequency; HF = high frequency; NT‐pro‐BNP; = N‐Terminal pro‐B‐type Natriuretic Peptide.
