1. Centre for Health Behaviours Research, JC School of Public Health and Primary Care, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong;
2. Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China;
3. Dermatology Hospital, Southern Medical University, Guangzhou, China;
4. Guangdong Provincial Dermatology Hospital, Guangzhou, China;
5. Tulane University, School of Public Health and Tropical Medicine, New Orleans, Louisiana, USA