1. Department of General Practice, Xujiahui Community Healthcare Center of Xuhui District of Shanghai, Shanghai 200030, P.R. China
2. Department of Nephrology, The Sixth People's Hospital affiliated to Shanghai Jiaotong University, Shanghai 200233, P.R. China
3. Department of Nephrology, Naval Medical Center of People's Liberation Army, Shanghai 200052, P.R. China
4. Department of Nephrology, The Tenth People's Hospital of Tongji University, Shanghai 200072, P.R. China
5. Department of Epidemiology, School of Public Health of Fudan University, Shanghai 200032, P.R. China