1. Department of Administration, Fengtai District Community Health Center, Beijing, China
2. Department of Epidemiology and Biostatics, School of Public Health, Capital Medical University, Beijing, China
3. Mood and Anxiety Clinic in the Mood Disorders Program, Department of Psychiatry, Case Western Reserve University School of Medicine/University Hospitals Case Medical Center, Cleveland, Ohio, USA
4. Fengtai Nanyuan Hospital, Beijing, China