Affiliation: | 1 Department of Spine Surgery, First People’s Hospital of Qingdao Economic & Technological Development Area, Qingdao 266555, Shandong Province, China 2 Second Clinical Medical College, Lanzhou University, Lanzhou 730000, Gansu Province, China 3 Department of Orthopedics, Nanchong Central Hospital, Nanchong 637000, Sichuan Province, China 4 Department of Spine Surgery, Lanzhou General Hospital of Lanzhou Military Region, Lanzhou 730050, Gansu Province, China 5 Department of Information, Qingdao Eighth People’s Hospital, Qingdao 266100, Shandong Province, China |