1. Department of Gastroenterology and Hepatology, Sichuan Academy of Medical Sciences & Sichuan Provincial People’s Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, Sichuan Province
2. Department of Gastroenterology, Changhai Hospital, Second Military Medical University and Naval Medical University, Shanghai, China
3. Department of Gastroenterology, Jiansanjiang People’s Hospital, Jiamusi, Heilongjiang Province, China