1 Hunan Provincial Key Laboratory of Clinical Epidemiology, Xiangya School of Public Health, Central South University, Changsha, China.
2 Hunan Province Key Laboratory of Typical Environmental Pollution and Health Hazards, School of Public Health, Hengyang Medical School, University of South China, Hengyang, China.
3 Department of Gastroenterology, Third Xiangya Hospital, Central South University, Changsha, China.
4 First Affiliated Hospital, Hengyang Medical School, University of South China, Hengyang, China.
5 Department of Medical Pathology, School of Basic Medical, Hengyang Medical School, University of South China, Hengyang, China.
6 Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China.
7 Jiangsu Provincial Center for Disease Control and Prevention, Nanjing, China.
8 Hunan Province Key Laboratory of Typical Environmental Pollution and Health Hazards, School of Public Health, Hengyang Medical School, University of South China, Hengyang, China; Hunan Provincial Key Laboratory of Clinical Epidemiology, Xiangya School of Public Health, Central South University, Changsha, China; Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China. Electronic address: phfyanglong@126.com.