Lippi, Giuseppe, Brandon M. Henry, Camilla Mattiuzzi, and Chiara Bovo. “The Death Rate for COVID-19 Is Positively Associated With Gross Domestic Products: Coronavirus and Gross Domestic Product”. Acta Biomedica Atenei Parmensis 91, no. 2 (May 11, 2020): 224–225. Accessed January 19, 2022. https://www.mattioli1885journals.com/index.php/actabiomedica/article/view/9514.