QRS Fragmentation in Preserved Ejection Fraction Heart Failure: Functional Insights, Pathological Correlates, and Prognosis by Kuo‐Tzu Sung, Sheng‐Hsiung Chang, Po‐Ching Chi, Shih‐Chieh Chien, Chi‐In Lo, Chao‐Feng Lin, Wen‐Hung Huang, Chun‐Ho Yun, Cheng‐Ting Tsai, Cheng‐Huang Su, Charles Jia‐Yin Hou, Hung‐I Yeh, Chin‐Ho Tsao, Jen‐Yuan Kuo, Chung‐Lieh Hung

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