1. Department of Gastrointestinal Surgery, People’s Hospital of Ningxia Hui Autonomous Region, the First Affiliated Hospital of Northwest Minzu University, Yinchuan, China
2. Department of Hepatobiliary Surgery, People’s Hospital of Ningxia Hui Autonomous Region, the First Affiliated Hospital of Northwest Minzu University, Yinchuan, China
3. Department of Gastroenterology, People’s Hospital of Ningxia Hui Autonomous Region, the First Affiliated Hospital of Northwest Minzu University, Yinchuan, China
4. Department of Digestive Endoscopy Center, People’s Hospital of Ningxia Hui Autonomous Region, the First Affiliated Hospital of Northwest Minzu University, Yinchuan, China