1. Department of Nephrology, The First Affiliated Hospital of the University of South China, Hengyang, China.
2. Department of Medicine, Hunan Environment-Biological Polytechnic, Hengyang, China.
3. Department of Nephrology, The Third Xiangya Hospital of Central South University, Changsha, China.
4. Department of Stomatology, The First Affiliated Hospital of the University of South China, Hengyang, China.