1. Cuiying Biomedical Research Center, The Second Hospital & Clinical Medical School, Lanzhou University, Lanzhou,
730030, China
2. Key Laboratory of Digestive System Tumors, The Second Hospital & Clinical Medical
School, Lanzhou University, Lanzhou, 730030, China
3. Department of General Surgery, The Second Hospital & Clinical Medical School, Lanzhou University,
Lanzhou, 730030, China