碎裂QRS波预警左心室收缩功能障碍患者心脏事件和死亡风险队列研究
쇄렬QRS파예경좌심실수축공능장애환자심장사건화사망풍험대렬연구
A cohort study on fragmented QRS as a predictor of prognosis of mortality and cardiac events in patients with left ventricular systolic dysfunction
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