1. Department of Gastroenterology, Third Xiangya Hospital, Central South University, Changsha, 410013, 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, 421001, China
3. Hunan Provincial Key Laboratory of Clinical Epidemiology, Xiangya School of Public Health, Central South University, Changsha, 410078, China
4. Department of Gastroenterology, the Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510510, China
5. Department of Gastroenterology, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou, 310018, China
6. Department of Gastroenterology, Chongqing General Hospital, University of Chinese Academy of Sciences, Chongqing, 401121, China
7. Health Management Center, Third Xiangya Hospital, Central South University, Changsha, 410013, China