1. Harvard Medical School, Boston, Massachusetts.
2. Division of Endocrinology, Diabetes and Hypertension, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts.
3. Section of Endocrinology, Diabetes and Metabolism, Lewis Katz School of Medicine, Philadelphia, Pennsylvania.
4. Center for Metabolic Disease Research, Lewis Katz School of Medicine, Philadelphia, Pennsylvania.
5. Department of Radiology, Brigham and Women's Hospital, Boston, Massachusetts.
6. Division of Cardiovascular Medicine, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts.