1. National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland;
2. Division of Clinical Epidemiology, Department of Medicine, University of Texas Health Science Center at San Antonio, San Antonio, Texas;
3. Department of Pathology, Virginia Commonwealth University, Richmond, Virginia;
4. Department of Laboratory Medicine and Pathology, Medical School, University of Minnesota, Minneapolis, Minnesota;
5. American Diabetes Association, Alexandria, Virginia.