1. Medical College, Qingdao University, Qingdao, Shandong, China
2. Department of Emergency Medicine, The Affiliated Hospital of Qingdao University, Qingdao, Shandong, China
3. Qingdao Municipal Hospital, Department of Spine Surgery Center, The 3rd Clinical College of Qingdao University, Qingdao, Shandong, China
4. Department of Exercise Physiology, Beijing Sport University, Beijing, China
5. Department of Osteology, Sunshine Union Hospital, Weifang, Shandong, China