D'Introno, Alessia, et al. “Acute Acalculous Cholecystitis As an Early Manifestation of COVID-19: Case Report and Literature Review”. Acta Biomedica Atenei Parmensis, vol. 93, no. S1, June 2022, p. e2022207, https://doi.org/10.23750/abm.v93iS1.12760.