1. The Kovler Diabetes Center (B.E.G., P.C.M., D.D., B.A.H., C.J.R.), Chicago, Illinois 60637
2. Department of Medicine,and Department of Pathology (M.L., A.H.), University of Chicago, Chicago, Illinois 60637
3. Department of Pathology, Immunology, and Laboratory Medicine (A.J.W., M.A.A.), University of Florida College of Medicine, Gainesville, Florida 32607