Hemiarthroplasty compared with internal fixation for treatment of nondisplaced femoral neck fractures in elderly patients: a retrospective study. - Chen, Jun-yuan; She, Guo-rong; Luo, Si-min; Wu, Wen-rui; Zhuang, Teng-feng; Huan, Song-wei; Liu, Ning; Zha, Zhen-gang (Injury, 2020)