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Linear regression between 1st and 7th day (A), 1st and 30th day (B), and 7th and 30th day (C) exercise tests for one‐minute heart rate recovery (HRR1) with cutoff value of 18. Only two patients had abnormal test on 1st and 7th days (Fig. 2A), two patients on 1st day and one patient on 30th day (Fig. 2B), and two patients on 7th day and one patient on 30th day (Fig. 2C).
