1. Department of Spinal Surgery, Orthopaedic Medical Center, Zhujiang Hospital, Southern Medical University, Guangzhou, Guangdong 510282, P.R. China
2. Department of Orthopedics, The Affiliated Hospital of Guizhou Medical University, Guiyang, Guizhou 550001, P.R. China
3. Department of Pathology, Hebei Eye Hospital, Xingtai, Hebei 054000, P.R. China
4. Department of Burns and Plastic Surgery, The 8th Medical Center of Chinese PLA General Hospital, Beijing 100091, P.R. China
5. Clinical Research Center, The Affiliated Hospital of Guizhou Medical University, Guiyang, Guizhou 550001, P.R. China