E. Amaral, A. Faúndes, N. S. L. Gonçales, J. Pellegrino Jr., C. A. de Souza, and J. L. P. e Silva, “ Prevalence of HIV and Treponema pallidum infections in pregnant women in Campinas and their association with socio-demographic factors ”, Sao Paulo Med J, vol. 114, no. 2, pp. 1108–1116, Mar. 1996.