1. Department of Gastroenterology, The Affiliated Changsha Central Hospital, Hengyang Medical School, University of South China, Changsha, China
2. Department of Gastroenterology, Xiangya Hospital, Central South University, Changsha, China
3. Department of Nephropathy, Xiangya Hospital, Central South University, Changsha, China
4. Department of Nephrology, The Affiliated Changsha Central Hospital, Hengyang Medical School, University of South China, Changsha, China
5. Department of General Surgery, The Affiliated Changsha Central Hospital, Hengyang Medical School, University of South China, Changsha, China