1. Department of Gastroenterology, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China
2. Department of Anatomy, Chongqing Medical University, Chongqing, China
3. School of Public Health and Management, Chongqing Medical University, Chongqing, China
4. The First School of Clinical Medicine, Chongqing Medical University, Chongqing, China
5. Department of Vascular Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China