1. Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama
2. Nephrology Research and Training Center, University of Alabama at Birmingham, Birmingham, Alabama
3. Division of Nephrology, Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana
4. Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Indianapolis, Indiana
5. Indiana Center for Biological Microscopy, Indianapolis, Indiana
6. Indianapolis Veterans Affairs Medical Center, Indianapolis, Indiana
7. Birmingham Veterans Administration Medical Center, Birmingham, Alabama