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(a) QTVI, (b) unexplained QTV, (c) SDNN_QT, and (d) unexplained SDNN_QT median values (25th; 75th percentile) in PHD subjects, EHD, MHD, and LHD patients and their control groups. (*statistically significant difference between EHD, MHD, and LHD patients and their controls)
