Meincke, R H, Osler, M, Mortensen, E L & Hansen, Å M 2016, ' Is Intelligence in Early Adulthood Associated With Midlife Physical Performance Among Danish Males? Journal of Aging and Health ', Journal of Aging and Health, vol. 28, no. 3, pp. 530-545 . https://doi.org/10.1177/0898264315594139