1. Research Division of Joslin Diabetes Center, Boston, MA
2. Department of Medicine, Harvard Medical School, Boston, MA
3. Department of Metabolic Diseases, Jagiellonian University Medical College, Krakow, Poland
4. Division of Nephrology, Department of Internal Medicine, Juntendo University School of Medicine, Tokyo, Japan
5. Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN