1. Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama, USA
2. Department of Medicine (Nephrology), University of Alabama at Birmingham, Birmingham, Alabama, USA
3. Department of Medicine (Nephrology), Fitzsimmons Army Medical Center, Aurora, Colorado, USA
4. Department of Pathology, Veterans Administration Medical Center, Denver, Colorado, USA
5. Department of Anatomic Pathology, Fitzsimmons Army Medical Center, Aurora, Colorado, USA