1. School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 P. R. China
2. Department of Pediatric Orthopedic Center for Orthopedic Surgery The Third Affiliated Hospital of Southern Medical University Guangzhou 510515 P. R. China
3. School of Materials Science and Engineering South China University of Technology Guangzhou 510641 P. R. China
4. Department of Orthopedic Surgery The First Affiliated Hospital Zhejiang University School of Medicine Hangzhou 310003 P. R. China
5. Department of Orthopedic Surgery Nanfang Hospital Southern Medical University Guangzhou 510515 P. R. China
6. Guangzhou Key Laboratory of Spine Disease Prevention and Treatment Department of Spine Surgery The Third Affiliated Hospital Guangzhou Medical University Guangzhou 510150 P. R. China