1 Department of Gastroenterology and Hepatology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, Sichuan Province, China.
2 School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan Province, China.
3 Department of Pathology, Sichuan Academy of Medical Sciences & Sichuan Provincial People's Hospital, Chengdu, Sichuan Province, China.