[1]
M. I. S. de Andrade, P. F. C. de Macêdo, T. L. P. S. de . Oliveira, N. M. da S. . Lima, I. da C. . Ribeiro, and T. M. . Santos, “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. Jun. 28, 2020. doi: 10.1590/SciELOPreprints.839.