1. Division of Behavioral Health and Health Promotion, The School of Public Health and Primary Care, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong
2. The Chinese University of Hong Kong Shenzhen Research Institute, Shenzhen, People's republic of China
3. Department of Behavioral and Social Sciences, Brown University School of Public Health, Providence, RI, USA
4. Centre for Medical Anthropology and Behavioral Health, Sun Yat-sen University, Guangzhou, People's republic of China
5. West China School of Public Health, Sichuan University, People's republic of China
6. Chengdu Center for Disease Control and Prevention, Sichuan, People's republic of China
7. School of Public Health, Drexel University, Philadelphia, USA