1. Departments of Endocrinology and Metabolic Diseases (N.R.B., M.J.E.W., A.A.v.d.K., A.M.P., J.W.A.S., F.R., J.A.R.), Leiden University Medical Center, 2300 RC Leiden, The Netherlands
2. Medical Statistics (R.W.), Leiden University Medical Center, 2300 RC Leiden, The Netherlands
3. Radiology (H.M.K.), Leiden University Medical Center, 2300 RC Leiden, The Netherlands
4. Epidemiology (M.K.), Leiden University Medical Center, 2300 RC Leiden, The Netherlands
5. Rheumatology (M.K.), Leiden University Medical Center, 2300 RC Leiden, The Netherlands