1. University of Pennsylvania School of Medicine (C.G.W., B.A.W.), Children’s Hospital of Philadelphia, Research Institute, Philadelphia, Pennsylvania 19104
2. Division of Endocrinology, Diabetes, and Metabolism (M.S.), Departments of Medicine and Genetics, and The Institute for Diabetes, Obesity, and Metabolism, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
3. Department of Pathology and Laboratory Medicine (B.R.B., J.W., R.A.Y., B.A.W.), Children’s Hospital of Philadelphia, Research Institute, Philadelphia, Pennsylvania 19104