1. Department of Community Medicine and Rehabilitation, Geriatric Medicine, Umeå University, Umeå, Sweden
2. Department of Public Health and Caring Sciences, Geriatric Medicine, Uppsala University, Uppsala, Sweden
3. Department of Clinical Microbiology, Virology, Umeå University, Umeå, Sweden
4. Centre for Demographic and Ageing Research, Umeå University, Umeå, Sweden
5. Umeå Center for Functional Brain Imaging, Umeå University, Umeå, Sweden
6. Department of Clinical Sciences, Psychiatry, Umeå University, Umeå, Sweden
7. Department of Radiation Sciences, Umeå University, Umeå, Sweden
8. Department of Integrative Medical Biology, Umeå University, Umeå, Sweden