1. Center for Health Behaviours Research, School of Public Health and Primary Care, School of Public Health, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong
2. The Chinese University of Hong Kong Shenzhen Research Institute, Shenzhen, China
3. Department of Applied Social Studies, The City University of Hong Kong, Kowloon, Hong Kong
4. Department of Medical Statistics and Epidemiology, School of Public Health, Sun Yat-sen University, Guangzhou, China