title: Author's reply.
authors.affiliation: Department of Orthopedics and Trauma Center of Emergency Medicine, the First Affiliated Hospital,School of Medicine, Zhejiang University, Hangzhou, China.
authors.forename: Jun-Song
authors.initials: JS
authors.lastname: Wu
authors.forename: Jing-Yu
authors.initials: JY
authors.lastname: Du
authors.forename: Xiang-Jin
authors.initials: XJ
authors.lastname: Lin