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Hartwig, TB, Sanders, T, Vasconcellos, D, Noetel, M, Parker, PD, Lubans, DR, Andrade, S, Ávila-García, M, Bartholomew, J, Belton, S, Brooks, NE, Bugge, A, Cavero-Redondo, I, Christiansen, LB, Cohen, K, Coppinger, T, Dyrstad, S, Errisuriz, V, Fairclough, S, Gorely, T et al, Javier Huertas-Delgado, F, Issartel, J, Kriemler, S, Kvalø, SE, Marques-Vidal, P, Martinez-Vizcaino, V, Møller, NC, Moran, C, Morris, J, Nevill, M, Ochoa-Avilés, A, O'Leary, M, Peralta, L, Pfeiffer, KA, Puder, J, Redondo-Tébar, A, Robbins, LB, Sanchez-Lopez, M, Tarp, J, Taylor, S, Tercedor, P, Toftager, M, Villa-González, E, Wedderkopp, N, Weston, KL, Yin, Z, Zhixiong, Z, Lonsdale, C and Del Pozo Cruz, B (2021) School-based interventions modestly increase physical activity and cardiorespiratory fitness but are least effective for youth who need them most: an individual participant pooled analysis of 20 controlled trials. British Journal of Sports Medicine, 55 (13). pp. 721-729. ISSN 1473-0480