[Clinical value of QT and its variance].
Yang
Z Y
ZY
D001145:Arrhythmias, Cardiac / Q000175:diagnosis; D003327:Coronary Disease / Q000175:diagnosis*; D004562:Electrocardiography; D006801:Humans; D006973:Hypertension / Q000175:diagnosis; D009203:Myocardial Infarction / Q000175:diagnosis