1. Department of Endocrinology; The Third Hospital of Hebei Medical University; Shijiazhuang Hebei China
2. Department of Neurology; Tianjin Medical University General Hospital; Heping District, Tianjin China
3. Department of Epidemiology; Tianjin Neurological Institute; Heping District, Tianjin China
4. Center of Clinical Epidemiology; Tianjin Medical University General Hospital; Heping District, Tianjin China