Andrade MIS de, MacĂȘdo PFC de, Oliveira TLPS de, Lima NM da S, Ribeiro I da C, Santos TM. 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 [Internet]. SciELO Preprints. 2020 [cited 2022 Jul. 2]. Available from: https://preprints.scielo.org/index.php/scielo/preprint/view/839