International Olympic Committee consensus statement on youth athletic development - Bergeron, M; Mountjoy, M; Armstrong, N; Chia, M; Côté, J; Emery, C; Faigenbaum, A; Hall, G; Kriemler, S; Léglise, M; Malina, R; Pensgaard, A; Sanchez, A; Soligard, T; Sundgot-Borgen, J; van Mechelen, W; Weissensteiner, J; Engebretsen, L (British Journal of Sports Medicine, 2015)