1. Department of Orthopedics, Xiangya Hospital Central South University, Hunan Engineering Research Center of Biomedical Metal and Ceramic Implants, Changsha, 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