1. Division of Endocrinology (A.M., P.H.), Columbia University Medical College, New York, New York 10032
2. Institute of Genetics and Biophysics (A.M.), Adriano Buzzati-Traverso, Consiglio Nazionale delle Ricerche, 80131 Naples, Italy
3. Department of Medicine, and Department of Surgery (A.M.S.), Columbia University Medical College, New York, New York 10032
4. Division of Endocrinology, Diabetes and Bone Diseases (J.C.A.-P., A.G.-O.), Diabetes, Obesity and Metabolism Institute, Icahn School of Medicine at Mount Sinai and The Mindich Child Health and Development Institute, New York, New York 10029