1. Department of Urology, Tai ’an Central Hospital, Tai ’an, Shandong, China
2. Department of Spine Surgery, Tai ’an Central Hospital, Tai ’an, Shandong, China
3. Department of Spinal Surgery, The Third People’s Hospital of Jinan, Jinan, Shandong, China
4. Department of Emergency, Qingdao Eighth People’s Hospital, Qingdao, China