1. Department of Emergency Trauma Surgery, Linyi City Central Hospital, Linyi, Shandong 276400, P.R. China
2. Department of Bone Surgery, Linyi City Central Hospital, Linyi, Shandong 276400, P.R. China
3. Department of Orthopedics, Taian City Central Hospital, Taian, Shandong 271000, P.R. China
4. Department of Bone Surgery, Heilongjiang Provincial Hospital, Harbin, Heilongjiang 150000, P.R. China
5. Department of Spine Surgery, Provincial Ear, Nose and Throat Hospital, Shandong Provincial Ear, Nose and Throat Hospital Affiliated to Shandong University, Jinan, Shandong 250012, P.R. China