Lippi, G., B. M. Henry, C. Mattiuzzi, and C. Bovo. “The Death Rate for COVID-19 Is Positively Associated With Gross Domestic Products: Coronavirus and Gross Domestic Product”. Acta Biomedica Atenei Parmensis, vol. 91, no. 2, May 2020, pp. 224-5, doi:10.23750/abm.v91i2.9514.