Philipova, Ivva, et al. “PREVALENCE OF PHARYNGEAL AND RECTAL CHLAMYDIA TRACHOMATIS AND NEISSERIA GONORRHOEAE INFECTIONS AMONG MSM IN SOFIA, BULGARIA”. PROBLEMS of Infectious and Parasitic Diseases, vol. 50, no. 1, Oct. 2022, pp. 19-24, https://doi.org/10.58395/pipd.v50i1.88.