1 Department of Environmental and Occupational Health, Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, PA, United States.
2 Department of Nutrition and Food Hygiene, School of Public Health, Hebei Medical University, Hebei Province Key Laboratory of Environment and Human Health, Shijiazhuang, China.
3 National Institute for Nutrition and Health, Chinese Center for Disease Control and Prevention, Beijing, China.
4 Department of Epidemiology and Biostatistics, Institute of Basic Medical Sciences Chinese Academy of Medical Sciences, School of Basic Medicine Peking Union Medical College, Beijing, China.