Effects of Resistance Band Exercises on Lower Limb Muscle Strength and Quality of Life in Pre-frail Elderly People 
CHEN Rujie,WU Qingwen,WANG Dongyan,GE Yujie,GAO Zhipeng
Chinese General Practice . 2019, (31): 3857 -3860 .  DOI: 10.12114/j.issn.1007-9572.2019.00.457