@article{vera-kellet_harz-fresno_manriquez_2014,  title={Labial ulcer: oral manifestation of syphilis},  volume={18},  ISSN={1413-8670},  url={https://doi.org/10.1016/j.bjid.2014.03.006},  DOI={10.1016/j.bjid.2014.03.006},  number={5},  journal={Brazilian Journal of Infectious Diseases},  publisher={Brazilian Society of Infectious Diseases},  author={Vera-Kellet, Cristian and Harz-Fresno, Isidora and Manriquez, Juan},  year={2014},  month={Sep},  pages={570–571} }