1. The Center for
Disease Control and Prevention in Fuling District, Chongqing 408000, China
2. College
of Life Science and Engineering, Chongqing Three Gorges University, Wanzhou, Chongqing 404100, China
3. The Township Central
Hospital in Yihe Town, Fuling District, Chongqing 408104, China
4. The Community
Health Service Center in Lidu Town, Fuling District, Chongqing 408103, China
5. Department
of Environmental Health, School of Public Health, Guangxi Medical University, Nanning, Guangxi 530021, China