Nascimento Peres, P.C. et al. 2017. Prevalence and respiratory function study of passive child smokers in the city of Santa Fe, Paraná and its association with socioeconomic level. O Mundo da Saúde. 41, 03 (Jul. 2017), 298–305. DOI:https://doi.org/10.15343/0104-7809.20174103298305.