Departments of Epidemiology and Medicine, Tulane University, New Orleans, Louisiana; jhe@tulane.edu. Departments of Epidemiology and. Welch Center for Prevention, Epidemiology, and Clinical Research, Johns Hopkins School of Medicine, Baltimore, Maryland; Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania; Departments of Epidemiology and Medicine, Tulane University, New Orleans, Louisiana; Medicine, Tulane University, New Orleans, Louisiana; Department of Medicine, University of Illinois College of Medicine, Chicago, Illinois; Division of Nephrology, St. John Hospital and Medical Center, Detroit, Michigan; Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland; and. Division of Kidney, Urologic, and Hematologic Diseases, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland.