Recommendations for promoting physical activity for children and adolescents in Germany - Graf, C; Beneke, R; Bloch, W; Bucksch, J; Dordel, S; Eiser, S; Ferrari, N; Koch, B; Krug, S; Lawrenz, W; Manz, K; Naul, R; Oberhoffer, R; Quilling, E; Schulz, H; Stemper, T; Stibbe, G; Tokarski, W; Völker, K; Woll, A (A consensus statement, 2014)