title: Response to Letter.
authors.affiliation: Department of Orthopedics, The People's Hospital of Three Gorges University the First People's Hospital of Yichang, Hubei, China.
authors.forename: Fei W
authors.initials: FW
authors.lastname: Wu
authors.forename: Jie
authors.initials: J
authors.lastname: Liang
authors.forename: Neng
authors.initials: N
authors.lastname: Ru
authors.forename: Sheng C
authors.initials: SC
authors.lastname: Zhou
authors.forename: Feng J
authors.initials: FJ
authors.lastname: Chen
authors.forename: De Y
authors.initials: Y
authors.lastname: Wu
authors.forename: Zong
authors.initials: Z
authors.lastname: Yang