Mattiuzzi, C. et al. 2020. SARS-CoV-2 recurrent RNA positivity after recovering from coronavirus disease 2019 (COVID-19): a meta-analysis. Acta Biomedica Atenei Parmensis. 91, 3 (Sep. 2020), e2020014. DOI:https://doi.org/10.23750/abm.v91i3.10303.