1. Departments of Endocrinology (M.D.), 1007 MB Amsterdam, The Netherlands
2. Departments of Endocrinology (M.D., J.K.R.), 2300 RC Leiden, The Netherlands
3. Radiology (H.J.L., E.L.E.), 2300 RC Leiden, The Netherlands
4. General Internal Medicine (M.A.v.d.R.), 2300 RC Leiden, The Netherlands
5. General Practice (Y.G.), Leiden University Medical Center, 2300 RC Leiden, The Netherlands
6. Julius Center for Health and Sciences and Primary Care (M.L.B.), University Medical Center Utrecht, 3508 GA Utrecht, The Netherlands
7. Clinical Epidemiology and Biostatistics (P.J.K.), VU University Medical Center, 1007 MB Amsterdam, The Netherlands