M. Riccò, G. Gualerzi, S. Ranzieri, and N. L. Bragazzi, “Stop playing with data: there is no sound evidence that Bacille Calmette-Guérin may avoid SARS-CoV-2 infection (for now)”., Acta Biomed, vol. 91, no. 2, pp. 207–213, May 2020, doi: 10.23750/abm.v91i2.9700.