CZAJKA, H. Safety and efficacy of vaccinations in patients from high-risk groups: new challenges in the era of vaccine hesitancy. European Journal of Clinical and Experimental Medicine, [S. l.], v. 17, n. 1, p. 83–88, 2019. DOI: 10.15584/ejcem.2019.1.14. Disponível em: https://journals.ur.edu.pl/ejcem/article/view/11758. Acesso em: 18 jan. 2026.