1. Department of Occupational and Environmental Health and State Key Laboratory of Environmental Health for Incubating, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
2. Dongfeng General Hospital, Dongfeng Motor Corporation and Hubei University of Medicine, Shiyan, China
3. Departments of Nutrition and Epidemiology, Harvard School of Public Health, Boston, MA