1. Department of Orthopaedic Surgery Peking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical College Beijing China
2. Department of Orthopaedic Surgery The First Hospital of Harbin and Harbin Institute of Technology Harbin China
3. Department of Spine Surgery Orthopedics Center of Guangdong Provincial People's Hospital and Guangdong Academy of Medical Sciences Guangzhou China
4. Department of Orthopedics Bejing Hospital of Traditional Chinese Medicine Beijing China