1. Department of Hepatobiliary Surgery, Xiangya Hospital, Central South University, Changsha, 410008 Hunan, China
2. Departments of Burn and Plastic, Ningxiang People's Hospital, Hunan University of Chinese Medicine, Changsha, 410600 Hunan, China
3. Department of Anesthesiology, Third Xiangya Hospital of Central South University, Changsha, 410008 Hunan, China
4. Department of Pathology, Xiangya Hospital, Central South University, Changsha, 410008 Hunan, China
5. National Clinical Research Center for Geriatric Disorders, Xiangya Hospital, Central South University, Changsha, 410008 Hunan, China