Silva, G.A.R. da et al. 2018. Prevalence of asymptomatic urethritis by Chlamydia trachomatis and Neisseria gonorrhoeae and associated risk factors among males living with HIV-1. Revista do Instituto de Medicina Tropical de São Paulo. 60, (Jan. 2018), e11. DOI:https://doi.org/10.1590/S1678-9946201860011.