1. Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, Zhengzhou, Henan, China
2. Department of Clinical Pharmacology, School of Pharmaceutical Science, Zhengzhou University, Zhengzhou, Henan, China
3. Department of Occupational and Environmental Health, School of Public Health, Xinxiang Medical University, Xinxiang, Henan, China
4. MOE Key Lab of Environment and Health, School of Public Health, Huazhong University of Science & Technology, Wuhan, Hubei, China