1. Department of Emergency Surgery, The Affiliated Qingdao Hiser Hospital of Qingdao University (Qingdao Hospital of Traditional Chinese Medicine), Qingdao, Shandong 266001, P.R. China
2. Department of Rheumatology, The Affiliated Qingdao Hiser Hospital of Qingdao University (Qingdao Hospital of Traditional Chinese Medicine), Qingdao, Shandong 266001, P.R. China
3. Department of Spine Surgery, The Affiliated Qingdao Hiser Hospital of Qingdao University (Qingdao Hospital of Traditional Chinese Medicine), Qingdao, Shandong 266001, P.R. China
4. Department of Internal Medicine, People's Hospital of Zhangqiu, Jinan, Shandong 250200, P.R. China