1. Renal-Electrolyte Division, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania;
2. Department of Cell Biology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania;
3. Division of Nephrology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana;
4. Department of Immunology and Department of Biochemistry and Molecular Biology, Mayo Clinic College of Medicine and Comprehensive Cancer Center, Mayo Clinic in Arizona, Scottsdale, Arizona;
5. Division of Anatomic Pathology, Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania;
6. Division of Pediatric Nephrology, Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania;
7. Division of Experimental Pathology, Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania;
8. Department of Medicine, Division of Nephrology and Hypertension, Vanderbilt University Medical Center, Nashville, Tennessee;
9. Medicine and Research Services, Department of Veterans Affairs Hospital, Tennessee Valley Healthcare System, Nashville, Tennessee; and
10. Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania