1Department of Medicine, Renal-Electrolyte and Hypertension Division, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania

2Department of Medicine, Division of Nephrology, Tufts Medical Center, Boston, Massachusetts

3Department of Medicine, One Brooklyn Health System, Brooklyn, New York

4Department of Medicine, VA Greater Los Angeles Healthcare System, David Geffen School of Medicine, University of California, Los Angeles, California

5Division of Epidemiology, Department of Internal Medicine, University of Utah, Salt Lake City, Utah

6Department of Medicine, Division of Nephrology, Vanderbilt University, Nashville, Tennessee

7Department of Internal Medicine, Division of Nephrology & Hypertension, University of Utah Health Sciences, Salt Lake City, Utah

Correspondence: Dr. Lesley A. Inker, Division of Nephrology, Tufts Medical Center, 800 Washington Street, Box 391, Boston, MA 02111. Email: [email protected]

Published online ahead of print. Publication date available at www.cjasn.org.

See related editorial, “Social Determinants of Health and Estimation of Kidney Function,” on pages 424–426.