1. Department of Oncology, Key Laboratory of Carcinogenesis and Cancer Invasion of Ministry of Education, National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha 410078, China
2. Cancer Research Institute, School of Basic Medicine Science, Central South University, Changsha 410078, China
3. Department of Pathology, Xiangya Hospital, Central South University, Changsha 410078, China
4. Department of Pathology, Xiangya Changde Hospital, Changde 415000, China