1. From the Division of Nephrology and Hypertension, Department of Medicine, Vanderbilt University School of Medicine, Nashville, TN (M.-Z.Z., S.W., Y.W., Y.Z., R.C.H.)
2. Vanderbilt Center for Kidney Disease, Vanderbilt University School of Medicine, Nashville, TN (M.-Z.Z., S.W., Y.W., R.C.H.)
3. Division of Nephrology, Huashan Hospital, Fudan University, Shanghai, China (C.M.H.)
4. Department of Veterans Affairs, Nashville, TN (R.C.H.).