Witkin, Steven S., Iara Linhares, Paulo Giraldo, e Willian J. Ledger. “Lnfluence of Human Papillomavirus Infection and Sexual Intercourse on Endocervical Epithelial Cell Immune Activity”. Brazilian Journal of Sexually Transmitted Diseases 11, no. 5 (fevereiro 22, 2022): 21–24. Acessado dezembro 5, 2025. https://bjstd.org/revista/article/view/351.