1. Department of Orthopedics Hunan Engineering Research Center of Biomedical Metal and Ceramic Implants Xiangya Hospital Central South University Changsha Hunan P. R. China
2. Department of Orthopedics The First Affiliated Hospital Medical College of Zhejiang University Hangzhou P. R. China
3. Department of Orthopedics The Sixth Affiliated Hospital Xinjiang Medical University Urumqi P. R. China