Mattiuzzi, Camilla, Brandon M. Henry, Fabian Sanchis-Gomar, and Giuseppe Lippi. 2020. “SARS-CoV-2 Recurrent RNA Positivity After Recovering from Coronavirus Disease 2019 (COVID-19): A Meta-Analysis”. Acta Biomedica Atenei Parmensis 91 (3): e2020014. https://doi.org/10.23750/abm.v91i3.10303.