Riccò, Matteo, Giovanni Gualerzi, Silvia Ranzieri, and Nicola Luigi Bragazzi. “Stop Playing With Data: There Is No Sound Evidence That Bacille Calmette-Guérin May Avoid SARS-CoV-2 Infection (for now)”. Acta Biomedica Atenei Parmensis 91, no. 2 (May 11, 2020): 207–213. Accessed January 19, 2022. https://www.mattioli1885journals.com/index.php/actabiomedica/article/view/9700.