1. Ministry of Education Key Laboratory of Environment and Health, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
2. Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China
3. Chinese Academy of Medical Sciences, Beijing, China
4. Clinical Trial Service Unit and Epidemiological Studies Unit, Nuffield Department of Population Health, University of Oxford, Oxford, United Kingdom