Frailty Prevalence and Associated Factors in Elderly Heart Failure Patients with Preserved Ejection Fraction　
YANG Qiqi，SUN Ying，XING Yunli，ZHANG Yanyang，LUO Zhi，WANG Yubo
Chinese General Practice . 2021, (11): 1354 -1358 .  DOI: 10.12114/j.issn.1007-9572.2021.00.411

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