1. Department of Public Health and Preventive Medicine, School of Medicine, Wuhan University of Science and Technology, Wuhan, Hubei 430065, P.R. China
2. Institute of Biomedical Research, Taihe Hospital, Hubei University of Medicine, Shiyan, Hubei 442000, P.R. China
3. Department of Gastroenterology, Tianyou Hospital Affiliated to Wuhan University of Science and Technology, Wuhan, Hubei 430065, P.R. China