1. Alzheimer's Disease Research Centre, Department of Neurobiology, Care Sciences and Society; Karolinska Institute; Stockholm Sweden
2. Centre for Age-Related Medicine; Stavanger University Hospital; Stavanger Norway
3. Department of Geriatric Psychiatry; Akershus University Hospital; Oslo Norway
4. Wellcome Trust Intermediate Clinical Fellow, Institute for Ageing and Health, and Honorary Consultant in Old Age Psychiatry, Northumberland; Tyne and Wear NHS Trust
5. Perelman School of Medicine at the University of Pennsylvania; Philadelphia PA
6. Parkinson's Disease Research; Education and Clinical Center (PADRECC); Philadelphia PA
7. Mental Illness Research; Education and Clinical Center (MIRECC); Philadelphia PA
8. Philadelphia Veterans Affairs Medical Center; Philadelphia PA