1. The Kidney Institute (M.P., L.D.Q.), Department of Internal Medicine, University of Kansas Medical Center, Kansas City, Kansas 66160;
2. NORAK Biosciences (R.H.O., R.D.C.), Morrisville, North Carolina 27709;
3. Division of Endocrinology (D.G.-P., R.F.S.), Department of Medicine, Duke University Medical Center, Durham, North Carolina 27701;
4. Division of Endocrinology (L.M.L.), Diabetes and Medical Genetics, Department of Medicine, Medical University of South Carolina, Charleston, South Carolina 29425