1. Department of Nephrology, The First Affiliated Hospital of Jinan University, Guangzhou, Guangdong 510632, P.R. China
2. Department of Rheumatology, The First Affiliated Hospital of Chengdu Medical College, Chengdu, Sichuan 610500, P.R. China
3. Department of Nephrology, The First Affiliated Hospital of Chengdu Medical College, Chengdu, Sichuan 610500, P.R. China