G. Solis, E. Pesaressi, and W. Mormontoy, “Trend and factors associated with the frequency of tooth brushing in children under twelve years old, Peru 2013-2018”, Rev Peru Med Exp Salud Publica, vol. 36, no. 4, pp. 562–72, Dec. 2019, doi: 10.17843/rpmesp.2019.364.4888.