1. Centre for Epidemiology and Biostatistics, The Chinese University of Hong Kong, Shatin, Hong Kong, China
2. Institute of Chinese Medicine, The Chinese University of Hong Kong, Shatin, Hong Kong, China
3. Hong Kong Department of Health, 32/F, Wu Chung House, 213 Queen's Road East, Wan Chai, Hong Kong, China
4. Department of Chemical Pathology, The Chinese University of Hong Kong, Shatin, Hong Kong, China
5. Hong Kong Hospital Authority, 147B, Arygle Street, Kowloon, Hong Kong, China