1. Departments of Endocrinology and Metabolism (R.M.A., H.V., H.H., G.C.H., E.P.C., A.M.P., J.A.R., J.W.S.) Leiden University Medical Center, 2300 RC Leiden, The Netherlands;
2. Department of Nuclear Medicine (E.V., C.R.), University of Würzburg, D-97070 Würzburg, Germany;
3. Departments of Oncology (H.G., E.K.), Leiden University Medical Center, 2300 RC Leiden, The Netherlands;
4. Department of Internal Medicine (T.J.V.), Erasmus University Medical Center, 3015 CE Rotterdam, The Netherlands