1Division of Nephrology, Tufts Medical Center, Boston

2Institute for Clinical Research and Health Policy Studies, Tufts Medical Center, Boston, Massachusetts; Tufts Clinical and Translational Science Institute, Tufts University, Boston, Massachusetts

3Kidney Health Research Collaborative, San Francisco Veterans Affair Medical Center and University of California, San Francisco

4Section on Genetics & Epidemiology, Joslin Diabetes Center, and the Department of Medicine, Harvard Medical School, Boston

5Division of Nephrology, Department of Medicine, San Francisco VA Health Care System and University of California, San Francisco

6Department of Research and Education, Lausanne University Hospital and University of Lausanne, Lausanne, Switzerland

7Faculty of Medicine, University of Iceland, Reykjavik, and the Icelandic Heart Association, Kopavogur, Iceland

8Department of Clinical Chemistry and Pharmacology, Institute of Laboratory Medicine, Lund University, Sweden

9Department of Medicine, Division of Nephrology, University of Maryland School of Medicine

10Divisions of Pediatric and Adult Nephrology, University of Minnesota, Minneapolis

11Steno Diabetes Center Copenhagen and the Department of Clinical Medicine, University of Copenhagen

12Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis

13Department of Epidemiology, John Hopkins Bloomberg School of Public Health, Baltimore

aCorresponding Author: Lesley A Inker MD, MS Division of Nephrology, Tufts Medical Center, 800 Washington Street, Box 391, Boston MA 02111; Tel: 617-636-2569; Fax: 617-636-8329; Email: [email protected]