N. J. Segri, C. L. G. Cesar, M. B. de A. Barros, M. C. G. P. Alves, L. Carandina, and M. Goldbaum, “ Health survey: comparison of interviewees according to ownership of a residential telephone line ”, Rev. saúde pública, vol. 44, no. 3, pp. 503–512, Jun. 2010, doi: 10.1590/S0034-89102010005000012.