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Niemann, Claudia; Wegner, Mirko; Voelcker-Rehage, Claudia; Holzweg, Martin; Arafat, Ayman M.; Budde, Henning (2013). Influence of physical activity and acute exercise on cognitive performance and saliva testosterone in preadolescent school children. Mental Health and Physical Activity, 6(3), pp. 197-204. Elsevier Science 10.1016/j.mhpa.2013.08.002