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Left ventricular ejection fraction (LVEF; mean ± standard error of the mean) in the intravenous immunoglobulin (IVIG) and control groups at baseline and post-treatment (4 weeks). There was no difference between the two groups in the mean LVEF at baseline (P=0.703). Post-treatment, the LVEF of the IVIG group was higher than that of the control group (P=0.011).
