Marioni, R. E., Proust-Lima, C., Amieva, H., Brayne, C., Matthews, F. E., Dartigues, J. F., & Jacqmin-Gadda, H. (2015). Social activity, cognitive decline and dementia risk: A 20-year prospective cohort study Chronic Disease epidemiology. BMC Public Health, 15(1), https://doi.org/10.1186/s12889-015-2426-6