ANDRADE, M. I. S. de; MACÊDO, P. F. C. de; OLIVEIRA, T. L. P. S. de .; LIMA, N. M. da S. .; RIBEIRO, I. da C. .; SANTOS, T. M. . Vitamin A and D deficiencies in the prognosis of respiratory tract infections: A systematic review with perspectives for COVID-19 and a critical analysis on supplementation. SciELO Preprints, 2020. DOI: 10.1590/SciELOPreprints.839. Disponível em: https://preprints.scielo.org/index.php/scielo/preprint/view/839. Acesso em: 14 aug. 2022.