“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”. Revista Contexto & Saúde, vol. 22, no. 46, Nov. 2022, p. e11026, https://doi.org/10.21527/2176-7114.2022.46.11026.