C. A. de M. Pimenta, M. S. Koizumi, and M. J. Teixeira, “Chronic pain and depression: study with 92 patients”, Rev. Esc. Enferm. USP, vol. 34, no. 1, pp. 76–83, Mar. 2000, doi: 10.1590/S0080-62342000000100010.