1. From the School for Mental Health and Neuroscience, Alzheimer Centre Limburg, Maastricht University, Maastricht, The Netherlands (S.K., P.S., S.S., F.R.J.V., M.J.P.v.B.); and Department of Geriatrics, Radboud Alzheimer Centre, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands (M.A.E.B.).