1. Departments of Endocrinology and Metabolic Diseases (M.J.E.W., N.R.B., A.M.P., A.A.v.d.K., J.W.A.S., F.R., J.A.R.), Leiden University Medical Center, 2300 RC Leiden, The Netherlands
2. Clinical Pharmacy and Toxicology (T.v.d.S., H.-J.G.), Leiden University Medical Center, 2300 RC Leiden, The Netherlands
3. Clinical Epidemiology (M.K.), Leiden University Medical Center, 2300 RC Leiden, The Netherlands
4. Rheumatology (M.K.), Leiden University Medical Center, 2300 RC Leiden, The Netherlands
5. Department of Gastroenterology (M.C.), Bronovo Hospital, 2509 JH The Hague, The Netherlands
6. Gastroenterology (D.W.H.), Leiden University Medical Center, 2300 RC Leiden, The Netherlands
7. Radiology (H.M.K.), Leiden University Medical Center, 2300 RC Leiden, The Netherlands