Barbalho, sandra, Katia P Sloan, Lance A Sloan, Ricardo A Goulart, Karina R. Quesada, Lucas Fornari Laurindo, Tereza Lais Menegucci Zutin, & Marcelo Dib Bechara. " Effects of Vitamin D in the Prophylaxis and Treatment of COVID-19: A Systematic Review." Medical Research Archives [Online], 10.6 (2022): n. pag. Web. 29 Apr. 2024