Effectiveness of vitamin D in the prevention and treatment of Covid-19. Research, Society and Development, [S. l.], v. 10, n. 13, p. e12101320883, 2021. DOI: 10.33448/rsd-v10i13.20883. Disponível em: https://rsdjournal.org/rsd/article/view/20883. Acesso em: 5 dec. 2025.