1. National Key Discipline of Human Anatomy, School of Basic Medical Sciences, Southern Medical University, Guangzhou, P.R. China
2. Guangdong Provincial Medical Biomechanical Key Laboratory, School of Basic Medical Sciences, Southern Medical University, Guangzhou, P.R. China
3. Orthopaedic Center, Affiliated Hospital of Guangdong Medical University, Guangdong Medical University, Zhanjiang, P.R. China
4. Department of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing, China