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APA Citation
Kobel, S., Kettner, S., Kesztyüs, D., Erkelenz, N., Drenowatz, C., & Steinacker, J. (n.d.). correlates of habitual physical activity and organized sports in German primary school children. Public health, 129(3), 237–243. http://access.bl.uk/ark:/81055/vdc_100031200750.0x00005d