55. Aberg MA, Pedersen NL, Toren K, Svartengren M, Backstrand B, Johnsson T, Cooper-Kuhn CM, Aberg ND, Nilsson M, Kuhn GH. Cardiovascular fitness is associated with cognition in young adulthood. Proc Natl Acad Sci USA 2009;106(49):20906-20911.