Relationship between Ejection Fraction and the Efficacy and Prognosis of Low-dose Spironolactone in the Treatment of Ejection Fraction-preserving Heart Failure 
KANG Rui,CHEN Ke,XIE Xiule,XU Jie
Chinese General Practice . 2020, (3): 281 -288 .  DOI: 10.12114/j.issn.1007-9572.2019.00.338