1. Department of Pancreatic Cancer, Tianjin Medical University Cancer Institute and Hospital, National Clinical Research Center of Cancer, Key Laboratory of Cancer Prevention and Therapy Tianjin's Clinical Research Center For Cancer Tianjin China
2. Department of Gastroenteropancreas Shanxi Provincial People's Hospital Taiyuan China
3. Graduate School Shanxi Medical University Jinzhong China
4. Department of Ultrasound The Second People's Hospital of Shanxi Province Taiyuan China