Barbalho, s., 		Sloan, K., 		Sloan, L., 		Goulart, R., 		Quesada, K., 		Laurindo, L., 		Zutin, T., & 		Bechara, M.
(2022).
 Effects of Vitamin D in the Prophylaxis and Treatment of COVID-19: A Systematic Review.
<em>Medical Research Archives, 10</em>(6).
doi:10.18103/mra.v10i6.2906