1. Clinical and Translational Research Center, College of Medicine, Charles R. Drew University of Medicine and Science, 1731 East 120th Street, Los Angeles, California 90059, USA
2. Office of Minority Health Research Coordination, NIDDK, National Institutes of Health, Building 2DEM, Room 902, 6707 Democracy Blvd., Bethesda, Maryland 20892, USA
3. Division of Nephrology, Department of Medicine, Charles R. Drew University of Medicine and Science, Clinical Research Center Annex, 11705 Deputy Yamamoto Place, Los Angeles, California 90262, USA