1. Department of Endocrinology and Metabolic Diseases (F.R., A.M.P., J.A.R.), Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
2. Department of Internal Medicine (R.A.), de Tjongerschans, 8441 PW Heerenveen, The Netherlands
3. Department of Endocrinology and Metabolism (E.E., E.F.), Academic Medical Center of the University of Amsterdam, 1100 DE Amsterdam, The Netherlands
4. Endocrine Research Unit (J.D.V.), Mayo Medical and Graduate Schools, Clinical Translational Research Center, Mayo Clinic, Rochester, Minnesota 55901