Division of Renal Medicine, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts; Dana Farber Cancer Institute, Boston, Massachusetts; and Harvard Medical School, Boston, Massachusetts

Correspondence: Dr. Shruti Gupta, Division of Renal Medicine, Department of Medicine, Brigham and Women's Hospital 75 Francis Street, MRB-4, Boston, MA 02115. Email: [email protected]

See related article, “Monoclonal Gammopathy and Its Association with Progression to Kidney Failure and Mortality in Patients with CKD,” on pages 319–328.