1. Department of Minimally Invasive, Shaanxi Cancer Hospital, Xi’an 710061, Shaanxi, China
2. Digestive Endoscopy Treatment Center, Xi’an International Medical Center Hospital, Gaoxin, Xi’an 710100, Shaanxi, China
3. Department of Gastroenterology, Xi’an International Medical Center Hospital, Gaoxin, Xi’an 710100, Shaanxi, China