WALCZAK, Klaudia et al. Effect of vitamin D on the course of COVID-19 infection. Journal of Education, Health and Sport, [S. l.], v. 13, n. 2, p. 261–267, 2023. DOI: 10.12775/JEHS.2023.13.02.038. Disponível em: https://apcz.umk.pl/JEHS/article/view/41445. Acesso em: 1 jul. 2025.