A cohort profile of the Vitality 90+ Study is openly available in BMJ open.
Enroth L, Halonen P, Tiainen K, Raitanen J, Jylhä M. 2023. Cohort profile: The Vitality 90+ Study. A cohort study on health and living conditions of the oldest old in Tampere, Finland. BMJ open, 13(2). http://dx.doi.org/10.1136/bmjopen-2022-068509