C. H. de S. Sigaud, A. B. de C. Castanheira, and P. Costa, “Association between secondhand smoking in the home and respiratory morbidity in preschool children”, Rev. Esc. Enferm. USP, vol. 50, no. 4, pp. 562–568, Aug. 2016, doi: 10.1590/S0080-623420160000500004.