[1] Zhengzhou Univ, Dept Geriatr Resp & Sleep, Affiliated Hosp 1, Zhengzhou, Peoples R China
[2] Zhengzhou Univ, Dept Orthopaed, Affiliated Hosp 1, Zhengzhou 450052, Peoples R China
[3] Tianjin Med Univ, Tianjin Baodi Hosp, Dept Spine & Joint Surg, Baodi Clin Coll, Tianjin, Peoples R China
[4] China Acad Chinese Med Sci, Wangjing Hosp, Dept Spine Surg, Beijing 100102, Peoples R China
[5] Hubei Univ Arts & Sci, Xiangyang Cent Hosp, Dept Orthopaed Surg, Affiliated Hosp, Xiangyang, Peoples R China
[6] Charite Univ Med Berlin, Ctr Musculoskeletal Surg CMSC, Berlin, Germany
[7] Humboldt Univ, Freie Univ Berlin, Berlin Inst Hlth, Berlin, Germany