Affiliation: | 1.Environment and School Health Branch, Gansu Province Centre for Disease Control and Prevention, No.230 Donggang West Road, Chengguan Area, Lanzhou, 730000, Gansu, China ;2.Department of Environmental Health, School of Public Health, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang, 110122, Liaoning, China ;3.Physical and Chemical Examination Centre, Gansu Province Centre for Disease Control and Prevention, No.335 Duan Jia Tan Road, Chengguan Area, Lanzhou, 730000, Gansu, China ;4.Department of Epidemiology, School of Public Health, China Medical University, No.77 Puhe Road, Shenyang North New Area, Shenyang, 110122, Liaoning, China ; |