Association between the physical activity environment in schools and childhood obesity: a view under the light of complex systems. SciELO Preprints, 2023. DOI: 10.1590/SciELOPreprints.5649. Disponível em: https://preprints.scielo.org/index.php/scielo/preprint/view/5649. Acesso em: 12 jun. 2026.