1. Department of Geriatric Surgery, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China.
2. Department of Gastroenterology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China.
3. Department of Pathology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China.
4. Department of Radiology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China.