1. Department of Oncology Tangdu Hospital Fourth Military Medical University Xi'an China
2. Department of Gastroenterology Guangzhou General Hospital of the Guangzhou Military Command of the PLA Guangzhou China
3. State Key Laboratory of Cancer Biology & Xijing Hospital of Digestive Diseases Fourth Military Medical University Xi'an China
4. Department of Thoracic Surgery Tangdu Hospital Fourth Military Medical University Xi'an China