1. Department of General Practice School of Clinical Medicine at Guangdong Medical University Dongguan Guangdong Province China
2. Department of Epidemiology and Health Statistics School of Public Health at Guangdong Medical University (Dongguan Key Laboratory of Chronic Noncommunicable Disease Prevention) Dongguan Guangdong Province China
3. Department of Social Medicine School of Public Health Shanxi Medical University Taiyuan Shanxi Province China
4. Departments of Psychiatry and Medicine Duke University Medical Center Durham North Carolina USA
5. Division of Psychiatry Department of Medicine King Abdulaziz University Jeddah Saudi Arabia