1. Department of Orthopedic Surgery; Peking University First Hospital; Beijing China
2. Center of Bone and Joint Disease; Peking University People's Hospital; Beijing China
3. Department of Orthopedic Surgery; General Hospital of the Chinese PLA Beijing Region; Beijing China
4. Department of Orthopedic Surgery; Shanghai Ninth People's Hospital; Affiliated to Shanghai Jiaotong University; Shanghai China
5. Department of Orthopedic Surgery; Jiangsu Provincial People's Hospital; Nanjing China