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Kratzenstein, Stephanie; Carlsohn, Anja; Heydenreich, Juliane; Mayer, Frank (2016). Dietary Supplement Use in Young Elite Athletes and School Children Aged 11 to 13 Years: A Cross-Sectional Study Design Deutsche Zeitschrift für Sportmedizin, 67(1), pp. 13-17. Dynamic Media Sales 10.5960/dzsm.2015.203