de Sa Del Fiol, Fernando, Silvio Barberato-Filho, Luciane Cruz Lopes, and Cristiane de Cassia Bergamaschi. “Vitamin D and Respiratory Infections”. The Journal of Infection in Developing Countries 9, no. 04 (April 15, 2015): 355-361. Accessed December 1, 2020. https://jidc.org/index.php/journal/article/view/25881523.