1. Department of Orthopedic Surgery, Beijing Ji Shui Tan Hospital Affiliated to Capital Medical University, Beijing, China (mainland)
2. Department of Orthopedic Surgery, Wuhan Third Hospital, Tongren Hospital of Wuhan University, Wuhan, Hubei, China (mainland)
3. Department of Orthopedic Surgery, Second People’s Hospital of Changzhi, Changzhi, Shanxi, China (mainland)
4. School of Public Health, North China University of Science and Technology, Tangshan, Hebei, China (mainland)