1. Department of Health Policy and Management, School of public health, Chinese Academy of Medical Sciences and Peking Union Medical College, No. 3 Dong Dan San Tiao, Dongcheng District, Beijing 100730, China
2. Department of Health Policy and Management, UCLA Fielding School of Public Health, 650 Charles Young Dr. S., 31-269 CHS Box, Los Angeles, CA 951772, USA
3. Department of Health Statistics, Beijing Municipal Health Commission Information Centre, No. 277 Zhao Deng Yu Lu, Xicheng District, Beijing 100034, China
4. Administrative Office, Peking University International Hospital, No. 29 Sheng Ming Yuan Lu, Haidian District, Beijing 102206, China
5. Department of Psychiatry and Behavioral Sciences, Emory University, 12 Executive Park Drive NE, Suite 300, Atlanta, GA 30329, USA
6. Mental Health Service Line, Atlanta VA Medical Center, 1670 Clairmont Road, Decatur, GA 30033, USA