1. Department of Nephrology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, P.R. China
2. Department of Nephrology, Qingpu Branch of Zhongshan Hospital Affiliated to Fudan University, Shanghai, P.R. China
3. Department of Nephrology, Shanghai Songjiang District Central Hospital, Shanghai, P.R. China
4. Department of Medicine, Rhode Island Hospital and Alpert Medical School, Brown University, Providence, RI, USA