title: Comment on Liu et al.: Meta-analysis of randomised controlled trials comparing unipolar with bipolar hemiarthroplasty for displaced femoral-neck fractures.
authors.affiliation: Department of Orthopedics, The Second Xiangya Hospital of Central South University, Changsha, 410011, China.
authors.forename: Xiao-yang
authors.initials: XY
authors.lastname: Li
authors.forename: Jie
authors.initials: J
authors.lastname: Bu
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.forename: Li-hong
authors.initials: LH
authors.lastname: Liu
authors.forename: Tao
authors.initials: T
authors.lastname: Xiao