1. Department of Orthopaedic Surgery, West China Hospital, West China Medical School, Sichuan University , Chengdu 610041 , China
2. School of Dentistry, University of Michigan , Ann Arbor, MI 48109-1078 , USA
3. Department of Sports Medicine, the First Affiliated Hospital of Shenzhen University, Shenzhen Second People's Hospital , Shenzhen 518035 , China