How endoscopy centers prepare to reopen after the acute COVID-19 pandemic interruption of activity. Issue 1 (January 2021) - Castagna, V; Armellini, E; Pace, F; Alvisi, C; Agazzi, S; Amato, A; Dioscoridi, L; Filippi, E; Gemme, C; Imbesi, V; Manes, G; et al.