1. Department of Environmental Health School of Public Health China Medical University Shenyang China
2. Guangdong Provincial Engineering Technology Research Center of Environmental and Health risk Assessment Department of Occupational and Environmental Health Sun Yat‐sen University Guangzhou China
3. Department of Preventive Medicine School of Public Health Shenyang Medical College Shenyang China
4. Department of Environmental Health Sciences University at Albany State University of New York Rensselaer NY
5. Department of Epidemiology and Biostatics University at Albany State University of New York Rensselaer NY
6. Health Inspection and Supervision Institute of Guangzhou Railway Bureau Guangzhou China