1. Department of Gastroenterology The First Hospital of Lanzhou University Lanzhou China
2. Key Laboratory for Gastrointestinal Diseases of Gansu Province The First Hospital of Lanzhou University Lanzhou China
3. Minqin People’s Hospital Minqin China
4. Department of Medical Administration The First Hospital of Lanzhou University Lanzhou China
5. Gansu Wuwei Tumour Hospital Wuwei China
6. Gansu Second Provincial People’s Hospital Lanzhou China