Temporal profile and determinants of viral shedding and of viral clearance confirmation on nasopharyngeal swabs from SARS-CoV-2-positive subjects: a population-based prospective cohort study in Reggio Emilia, Italy. - Mancuso P; Venturelli F; Vicentini M; Perilli C; Larosa E; Bisaccia E; Bedeschi E; Zerbini A; Rossi PG (BMJ open, 2020)