1. Department of Orthopedics, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, Guangdong, China (mainland)
2. Department of Mechanical Engineering, Tsinghua University, Beijing, China (mainland)
3. Department of Spine Surgery, Beijing Jishuitan Hospital, Beijing, China (mainland)
4. Department of Orthopedics, First Affiliated Hospital of Shenzhen University, Shenzhen, Guangdong, China (mainland)