1. Division of Endocrinology, Metabolism, and Nutrition (R.B., A.B., E.G.C., R.A.R.), Rochester, Minnesota 55905;
2. Departments of Laboratory Medicine and Pathology (R.J.S.), Rochester, Minnesota 55905;
3. Vascular and Interventional Radiology (M.C.J.), Mayo Clinic, Rochester, Minnesota 55905;
4. Department of Information Engineering (G.T., C.C.), University of Padua, 35131 Padua, Italy