1. Jockey Club School of Public Health and Primary Care, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
2. Xiangya School of Public Health, Central South University, Changsha, Hunan, China
3. Hunan Provincial Key Laboratory of Clinical Epidemiology, Changsha, Hunan, China
4. Department of Epidemiology, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
5. School of Chinese Medicine, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong