Vasilev, Petar, et al. “COMPARATIVE ASSESSMENT OF THE NUMBER AND IMMUNOLOGICAL STATUS OF NEWLY DIAGNOSED AND RE-ENROLLED IN CARE HIV+ IN THE PERIOD 2018–2019 AND 2020-2021”. PROBLEMS of Infectious and Parasitic Diseases, vol. 50, no. 1, Oct. 2022, pp. 12-18, https://doi.org/10.58395/pipd.v50i1.80.