Impact of COVID-19 pandemic on outpatient visit volume in cancer patients: Results of COMETA multicenter retrospective observational study oleh Vincenza Frisardi, Oronzo Brunetti, Vincenza Abbinante, Marco Ardigò, Giuseppina Caolo, Annunziata Di Turi, Alessandra Torsello, Christian Napoli, Rita Mancini, Valeria Belleudi, Antonio Addis, Ornella Di Bella, Gennaro Ciliberto, Antonino Neri, Romina Corsini, Patrizia Ruggieri, Chiara Pollorsi, Nicola Silvestris