Gestational syphilis: an epidemiological study in Northeastern Brazil. Research, Society and Development, [S. l.], v. 10, n. 6, p. e51210616001, 2021. DOI: 10.33448/rsd-v10i6.16001. Disponível em: https://rsdjournal.org/rsd/article/view/16001. Acesso em: 5 dec. 2025.