1. School of Public Health, Li Ka Shing Faculty of Medicine; The University of Hong Kong; Pokfulam Hong Kong
2. Guangzhou Number 12 Hospital; Guangzhou China
3. Department of Public Health and Epidemiology; University of Birmingham; Birmingham UK
4. Department of Social and Behavioral Sciences; Harvard School of Public Health; Boston MA USA
5. Department of Epidemiology; Harvard School of Public Health; Boston MA USA
6. Department of Psychiatry; Massachusetts General Hospital; Boston MA USA
7. Health Behavior Branch, Division of Intramural Population Health Research; Eunice Kennedy Shriver National Institute of Child Health and Human Development; Rockville MD USA
8. School of Public Health; Hunter College and CUNY; New York NY USA