title: To the Editor.
authors.affiliation: Orthopedic center, the 309th Hospital of Chinese People's Liberation Army, Beijing 100091, China.
authors.forename: Xiao-bo
authors.initials: XB
authors.lastname: Luo
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
authors.forename: Jian-cheng
authors.initials: JC
authors.lastname: Xi
authors.forename: Xiao-jun
authors.initials: XJ
authors.lastname: Cai
authors.forename: Yuan-zheng
authors.initials: YZ
authors.lastname: Ma
mesh_terms: D004824:Epidural Space / Q000601:surgery*; D005260:Female; D006407:Hematoma, Epidural, Cranial / Q000601:surgery*; D046748:Hematoma, Epidural, Spinal / Q000601:surgery*; D006801:Humans; D013116:Spinal Cord / Q000601:surgery*; D013117:Spinal Cord Compression / Q000601:surgery*