Persistent positivity and fluctuations of SARS-CoV-2 RNA in clinically-recovered COVID-19 patients. Issue 3 (September 2020) - Cento, Valeria; Colagrossi, Luna; Nava, Alice; Lamberti, Anna; Senatore, Sabrina; Travi, Giovanna; Rossotti, Roberto; Vecchi, Marta; Casati, Ornella; Matarazzo, Elisa; Bielli, Alessandra; Casalicchio, Giorgia; et al.