1. Department of Joint Surgery, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, P.R. China
2. Department of Orthopedic Surgery, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, P.R. China
3. Department of Orthopedic Surgery, Peking Union Medical College Hospital, Peking Union Medical College, Beijing 100730, P.R. China
4. Department of Oral Implantology, The Affiliated Hospital of Qingdao University, Qingdao, Shandong 266003, P.R. China