1. Department of Epidemiology, School of Public Health, Sun Yat-Sen University, Guangzhou 510080, China
2. School of Psychology and Counselling, Queensland University of Technology, Brisbane, QLD 4059, Australia
3. School of Basic Medical Science, Guangzhou Medical University, Guangzhou 511436, China
4. School of Health, Xinhua College of Guangzhou, Guangzhou 510080, China