D. Kovačić, A. A. Gajić, D. Latinović, and A. Softić, “Hypothetical Immunological and Immunogenetic Model of Heterogenous Effects of BCG Vaccination in SARS-CoV-2 Infections: BCG-induced Trained and Heterologous Immunity”, JMS, vol. 90, no. 4, p. e551, Dec. 2021, doi: 10.20883/medical.e551.