1. Department of Gastroenterology, Affiliated Provincial Hospital, Anhui Medical University, Hefei 230001, P. R. China
2. Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, P. R. China
3. The CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Life Sciences and Medical Center, University of Science and Technology of China, Hefei 230027, P. R. China
4. The Department of Medical Imaging Guangdong Second Provincial General Hospital, Southern Medical University, Guangzhou 518037, P. R. China