Adami, G., A. Giollo, A. Fassio, C. Benini, E. Bertoldo, F. Bertoldo, G. Orsolini, et al. “Vitamin D and Disease Severity in Coronavirus Disease 19 (COVID-19)”. Reumatismo 72, no. 4 (January 18, 2021): 189–196. Accessed November 22, 2024. https://www.reumatismo.org/reuma/article/view/1333.