Ricardo, L., Rombaldi, A., Kopp, D., Ferreira, R., Hallal, P., & Azevedo, M. (2016). Stages of Change for physical activity after a school-based intervention: a cross-sectional study. Revista Brasileira De Atividade Física & Saúde, 20(6), 569. https://doi.org/10.12820/rbafs.v.20n6p569