1. Department of Gastroenterology, Jiangsu University Cancer Institute, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212001, P.R. China
2. Department of Radiation Oncology, Jiangsu University Cancer Institute, Affiliated Hospital of Jiangsu University, Zhenjiang, Jiangsu 212001, P.R. China
3. Jiangsu Key Laboratory of Medical Science and Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang Jiangsu 212013, P.R. China