1. Departments of Internal Medicine (J.M.d.L., C.R.P., M.F.v.d.B., G.D.V.), 3508 GA Utrecht, The Netherlands
2. Department of Clinical Epidemiology and Biostatistics (J.W.T.), VU University Medical Center, 1007 MB, Amsterdam, The Netherlands
3. Department of Endocrinology (A.R.H.), Radboud University Medical Center, 6500 HB Nijmegen, The Netherlands
4. Departments of Endocrinology and Metabolism and Clinical Epidemiology (O.M.D.), Leiden University Medical Center, 2300 RC Leiden, The Netherlands
5. Department of Internal Medicine (W.W.d.H.), Erasmus Medical Center, 3000 CA Rotterdam, The Netherlands
6. Department of Endocrinology (A.N.v.d.H.-S.), University Medical Center Groningen, 9700 RB Groningen, The Netherlands
7. Department of Internal Medicine (M.L.D.), Section of Endocrinology, VU University Medical Center, 6202 AZ Amsterdam, The Netherlands
8. Department of Endocrinology and Metabolism (P.H.B.), Academic Medical Center, 1100 DD Amsterdam, The Netherlands
9. Department of Internal Medicine (B.H.), Division of Endocrinology, Maastricht University Medical Center, 6202 AZ Maastricht, The Netherlands
10. Surgery (M.R.V.), University Medical Center Utrecht, 3508 GA Utrecht, The Netherlands