1. Department of Occupational and Environmental, Xiangya School of Public Health, Central South University, Changsha, China
2. Department of Gastroenterology, The Third Xiangya Hospital, Central South University, Changsha, China
3. Key laboratory of Hunan Province for Water Environment and Agriculture Product Safety, Central South University, Changsha, China
4. Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health Southeast University, Nanjing, China