1. Department of Neuropsychiatry and Psychosomatic Medicine, Oslo University Hospital-Rikshospitalet, 0027 Oslo, Norway
2. Department of Gerontopsychiatry, Akershus University Hospital, 1478 Lørenskog, Norway
3. Institute of Clinical Medicine, University of Oslo, 0316 Oslo, Norway
4. Department of Neurosurgery, Oslo University Hospital-Rikshospitalet, 0027 Oslo, Norway
5. Department of Neurology, Oslo University Hospital-Rikshospitalet, 0027 Oslo, Norway
6. Department of Biostatistics and Epidemiology, Oslo University Hospital-Rikshospitalet, 0450 Oslo, Norway
7. Department of Psychology, University of Oslo, 0316 Oslo, Norway
8. Centre for Age-Related Medicine, Stavanger University Hospital, 4068 Stavanger, Norway
9. Department of Neurobiology, Care Sciences and Society, Karolinska Institute, 17176 Stockholm, Sweden