A multi-level analysis of individual- and school-level correlates of physical fitness in children - Santos, Carla; Reyes, Ana Carolina; Moura-Dos-Santos, Marcos André; Pereira, Sara; Gomes, Thayse Natacha; Tani, Go; Vasconcelos, Olga; Chaves, Raquel N; Garganta, Rui; Barreira, Tiago V; Katzmarzyk, Peter T; Maia, José (Annals of Human Biology, 2018)