1. JC School of Public Health and Primary Care; Division of Occupational and Environmental health, The Chinese University of Hong Kong; Hong Kong SAR China
2. West China School of Public Health; Department of nutrient hygiene, Sichuan University; Chengdu Sichuan China
3. Hong Kong Occupational and Environmental Health Academy; Kowloon Hong Kong China
4. Department of Environmental Health; Harvard School of Public Health; Boston MA