Souza, Lúcia M S, José C Nery, and Arnaldo FB Andrade. 2006. “Co-infecção Between Syphilisand Human Papilomavirus: Brokena Vertical Transmission Chain”. Brazilian Journal of Sexually Transmitted Diseases 18 (4). Niterói:266-69. https://www.bjstd.org/revista/article/view/683.