1. Department of Pathology and Laboratory Medicine, Penn Medicine Lancaster General Hospital , Lancaster, PA , United States
2. Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania , Philadelphia, PA , United States
3. Departments of Pathology and Medicine, Johns Hopkins University School of Medicine , Baltimore, MD , United States
4. Department of Medicine, Cumming School of Medicine, University of Calgary, Calgary , AB , Canada
5. Division of Nephrology, University of Alberta , Edmonton, AB , Canada
6. Population Health Research Institute , Hamilton, ON , Canada
7. Department of Laboratory Medicine, Cleveland Clinic , Cleveland, OH , United States
8. Department of Medicine, Harvard Medical School , Boston, MA , United States
9. Division of Nephrology and Department of Medicine, Beth Israel Deaconess Medical Center , Boston, MA , United States
10. Kaiser Permanante, The Permanante Medical Group Regional Laboratory , Berkeley, CA , United States
11. Renal-Electrolyte Division, Department of Medicine, University of Pittsburgh , Pittsburgh, PA , United States
12. Kidney Medicine Program and Kidney Medicine Section, Veterans Affairs Pittsburgh Healthcare System , Pittsburgh, PA , United States
13. The National Kidney Foundation, Inc. , New York, NY , United States
14. Departments of Pathology, Critical Care Medicine, and Clinical and Translational Science, University of Pittsburgh School of Medicine , Pittsburgh, PA , United States
15. Kidney and Hypertension Unit, Joslin Diabetes Center and Harvard Medical School , Boston, MA , United States
16. Division of Nephrology, Department of Medicine, Beth Israel Deaconess Medical Center , Boston, MA , United States
17. Division of Nephrology, Department of Medicine, Icahn School of Medicine at Mount Sinai , New York, NY , United States
18. Department of Sociology, Western Washington University , Bellingham, WA , United States
19. Department of Laboratory Medicine and Pathology, University of Washington Medicine , Seattle, WA , United States
20. LetsGetChecked Laboratories , Monrovia, CA , United States