How should health systems prepare for the evolving COVID-19 pandemic? Reflections from the perspective of a Tertiary Cancer Center Andre Tsin Chih Chen; Camila Motta Venchiarutti Moniz; Ulysses Ribeiro-Júnior; Maria Del Pilar Estevez Diz; João Victor Salvajoli; Karina Gondim Moutinho Da Conceição Vasconcelos; José Otávio Costa Auler-Júnior; Ivan Cecconello; Edson Abdala; Paulo Marcelo Gehm Hoff;