Ferreira, O., C. Lisboa, F. M. Ramos, and F. Azevedo. “SYPHILIS IN A SEXUALLY TRANSMITTED DISEASES CLINIC – ANALYSIS OF 880 PATIENTS”. Journal of the Portuguese Society of Dermatology and Venereology, Vol. 70, no. 1, Jan. 2013, p. 99, doi:10.29021/spdv.70.1.43.