1. University of Amsterdam; Department of Neurology, Academic Medical Centre; Meibergdreef 9 Amsterdam Netherlands 1105 AZ
2. University of Edinburgh; Centre for Cognitive Ageing and Cognitive Epidemiology and the Alzheimer Scotland Dementia Research Centre; Department of Geriatric Medicine, The Royal Infirmary of Edinburgh, Room S1642 51 Little France Crescent Edinburgh UK EH16 4SB
3. University of Glasgow; Institute of Cardiovascular and Medical Sciences; Walton Building Glasgow Royal Infirmary Glasgow UK G4 0SF
4. Radboud University Nijmegen Medical Center; Department of Neurology; Nijmegen Netherlands