1. Medical Department Diakonhjemmet Hospital Oslo Norway
2. Division of Epidemiology Norwegian Institute of Public Health Oslo Norway
3. Department of Community Health UiT The Arctic University of Norway Tromsø Norway
4. Department of General Internal Medicine Oslo University Hospital Oslo Norway
5. Department of Biostatistics, Institute of Basal Medical Sciences University of Oslo Oslo Norway
6. Department of Public Health and Community Medicine Gothenburg University Gothenburg Sweden
7. Kavli Research Centre for Ageing and Dementia Department of Clinical Science University of Bergen Bergen Norway