1. School of Geosciences and Info-physics,Central South University, Changsha, Hunan, China
2. Department of Occupational and Environmental Health, Xiangya School of Public Health, Central South University, Changsha, China
3. Key Laboratory of Biometallurgy, Ministry of Education, School of Mineral Processing and Bioengineering, Central South University, Changsha, China
4. Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China