1. Department of Nephrology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
2. Department of Pathology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
3. Department of Medical Records and Information, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China