1. Department of Gastroenterology and Hepatology, West China Hospital, Med-X Center for Materials, Sichuan University, Chengdu, Sichuan 610041, China
2. Digestive Endoscopy Medical Engineering Research Laboratory, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
3. West China School of Nursing, Sichuan University, Chengdu, Sichuan 610041, China