1. Hebei Medical University Hospital No. 3, Shijiazhuang, Hebei, China (mainland)
2. Orthopedic Ward, Xingtai Mining Bureau General Hospital, Xingtai, Hebei, China (mainland)
3. Orthopedic Ward, No.215 Hospital of Shaanxi Nuclear Industry, Xi’an, Shaanxi, China (mainland)
4. Department of Osteopathology, Hebei Medical University Hospital No. 3, Shijiazhuang, Hebei, China (mainland)