1. School of Public Health, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
2. Institute for Hospital Management of Tsinghua University, Beijing, China
3. Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, GA, USA
4. Department of Psychiatry, Chaohu Hospital of Anhui Medical University, Hefei, China
5. Atlanta VA Medical Center, Decatur, Georgia, USA