Passos, Mauro Romero Leal, et al. “The Status of Syphilis in Pregnant Women in Brazil: Do We Need a National (or world?) Day of Syphilis Combat? Is Syphilis a Public Health Problem Only in Brazil?”. Brazilian Journal of Sexually Transmitted Diseases, vol. 30, no. 1, Mar. 2018, pp. 6-11, https://www.bjstd.org/revista/article/view/823.