1. Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania
2. Division of Metabolism, Endocrinology, and Nutrition, Department of Medicine, University of Washington School of Medicine, Seattle, Washington
3. Division of Endocrinology, Department of Medicine, University of Minnesota, Minneapolis, Minnesota
4. Pacific Northwest Diabetes Research Institute, Seattle, Washington