1. Departments of Endocrinology (J.W.A.S., A.M.P., J.A.R.), Leiden University Medical Center, 2300 RC Leiden, The Netherlands
2. Department of Nuclear Medicine (M.P.M.S.), Leiden University Medical Center, 2300 RC Leiden, The Netherlands
3. Department of Internal Medicine (T.J.V.), Erasmus University Medical Center, 3000 CA Rotterdam, The Netherlands