1. Departments of Epidemiology and Biostatistics (F.J.d.J., T.d.H., A.H., M.M.B.B.) 3000 DR Rotterdam, The Netherlands
2. Neurology (F.J.d.J., T.d.H.) 3000 DR Rotterdam, The Netherlands
3. Internal Medicine (T.J.V., Y.B.d.R.) 3000 DR Rotterdam, The Netherlands
4. Immunology (H.A.D.), Erasmus Medical Center, 3000 DR Rotterdam, The Netherlands