1. Boston Medical Center and Section of Nephrology, Department of Medicine, Boston University Chobanian & Avedisian School of Medicine, Boston, Massachusetts (A.V., S.S.W.)
2. Boston Medical Center and Section of Nephrology, Department of Medicine, Boston University Chobanian & Avedisian School of Medicine, Boston, Massachusetts; and Hamburg Center for Kidney Health, University Medical Center Hamburg, Hamburg, Germany (I.M.S.)
3. Department of Medicine, Boston University Chobanian & Avedisian School of Medicine, Boston, Massachusetts (S.C.)
4. Division of Nephrology, Department of Medicine, Massachusetts General Hospital, Boston, Massachusetts (R.P.)
5. Division of Nephrology, Department of Medicine, University of Illinois Chicago, Chicago, Illinois (A.S.).