1. Section for Metabolic Receptology (Z.G.-H.), Novo Nordisk Foundation Center for Basic Metabolic Research, University of Copenhagen, 2200 Copenhagen, Denmark;
2. Division of Endocrinology, Diabetes, and Metabolism (M.A.L.), Department of Medicine, Department of Genetics, and The Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104