1. Department of Oncology, Xiangya Hospital, Central South University, Changsha, 410008, Hunan, PR China
2. Department of Gastroenterology and Urology, Hunan Cancer Hospital/The Affiliated Cancer Hospital of Xiangya School of Medicine, Central South University, Changsha, 410013, Hunan, PR China
3. Department of Pathology, Changsha Central Hospital, Changsha, 410004, Hunan, PR China