State Key Laboratory of Environment Health (Incubation), Key Laboratory of Environment & Health (Ministry of Education), Ministry of Environmental Protection Key Laboratory of Environment and Health (Wuhan), Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China. Department of Urology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China. College of Informatics, Huazhong Agricultural University, Wuhan, China. State Key Laboratory of Environment Health (Incubation), Key Laboratory of Environment & Health (Ministry of Education), Ministry of Environmental Protection Key Laboratory of Environment and Health (Wuhan), Department of Epidemiology and Biostatistics, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China. miaoxp@hust.edu.cn.