1. Departments of Neurology (L.M.L.v.W., C.H.P., B.M.J.U.), Vrije Universiteit Medical Center, De Boelelaan 1117, 1081 HV Amsterdam, The Netherlands
2. Department of Internal Medicine (L.M., E.F.C.v.R., J.W.K.), Erasmus Medical Center, Rotterdam 3000 DR, The Netherlands
3. Pathology (B.A.C.), Vrije Universiteit Medical Center, De Boelelaan 1117, 1081 HV Amsterdam, The Netherlands
4. Epidemiology and Biostatistics (B.M.J.U.), Vrije Universiteit Medical Center, De Boelelaan 1117, 1081 HV Amsterdam, The Netherlands