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Abnormal chronotropic response index at stage 2 in treadmill exercise test and its clinical significance among non-elderly patients with coronary heart disease
LIU Zhihua, GAO Yaoming, WU Yubing
Practical Electrocardiology and Clinical Treatment . 2026, (3): 455 -460 .  DOI: 10.13308/j.issn.2097-5716.xd20260045