1. Department of Gastroenterology, The Third Affiliated Hospital, College of Medicine, Xi’an Jiaotong University, Xi’an, China
2. Department of General Surgery, The Third Affiliated Hospital, College of Medicine, Xi’an Jiaotong University, Xi’an, China
3. State Key Laboratory of Cancer Biology & Xijing Hospital of Digestive Diseases, Fourth Military Medical University, Xi’an, China
4. Department of Gastroenterology, The First Affiliated Hospital, College of Medicine, Xi'an Jiaotong University, Xi’an, China