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Unfortunately, the position of the S' wave was incorrectly indicated in figure 4a in the manuscript above. The corrected figure is presented below. The authors apologise for this error.

Figure 4.

a) Measurement of myocardial performance index (MPI) using tissue Doppler imaging. S': systolic wave; IVCT: isovolumic contraction time; IVRT: isovolumic relaxation time. b) Measurement of tricuspid annular plane systolic excursion (TAPSE). ET: ejections time.