1. Department of Endocrinology, Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, China.
2. Department of Orthopaedic Surgery, Third Hospital of Hebei Medical University, Shijiazhuang, Hebei, China.
3. Department of Epidemiology and Health Statistics, School of Public Health, Heibei Medical University, Shijiazhuang, Hebei, China.