Adami, G., Giollo, A., Fassio, A., Benini, C., Bertoldo, E., Bertoldo, F., … Rossini, M. (2021). Vitamin D and disease severity in coronavirus disease 19 (COVID-19). Reumatismo, 72(4), 189–196. https://doi.org/10.4081/reumatismo.2020.1333