L. V. Pereira, G. de A. Pereira, L. A. de Moura, and R. R. Fernandes, “ Pain intensity among institutionalized elderly: a comparison between numerical scales and verbal descriptors ”, Rev. Esc. Enferm. USP, vol. 49, no. 5, pp. 804–810, Oct. 2015, doi: 10.1590/S0080-623420150000500014.