1 Department of Gastroenterology, West China Hospital, Sichuan University, No. 37 Guo Xue Alley, Wu Hou District, Chengdu City, 610041, Sichuan Province, China.
2 Department of Radiology, West China Hospital, Sichuan University, Chengdu, China.
3 Department of Gastroenterology, West China Hospital, Sichuan University, No. 37 Guo Xue Alley, Wu Hou District, Chengdu City, 610041, Sichuan Province, China. hubingnj@163.com.