1. Division of Endocrinology, Metabolism, and Molecular Medicine (P.V., P.A.K., M.E.M.), Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611
2. Georg-August University of Göttingen (K.L.), 37073 Göttingen, Germany
3. Division of Endocrine Surgery (D.E.), Feinberg School of Medicine, Northwestern University, Chicago, Illinois 60611