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Physical activity of German children and adolescents 2003-2..:

Schmidt, Steffen C. E ; Henn, Annette ; Albrecht, Claudia.
International journal of environmental research and public health.  14 (2017)  11 - p. Art.-ID 1375, [10] , 2017
Link: https://doi.org/10.3390/ijerph14111375