Evidence-based recommendations for gastrointestinal cancers during the COVID-19 pandemic by the Brazilian Gastrointestinal Tumours Group - Riechelmann, Rachel; Peixoto, Renata D'Alpino; Fernandes, Gustavo Dos Santos; Weschenfelder, Rui F; Prolla, Gabriel; Rocha Filho, Duilio; Andrade, Aline Chaves; Crosara, Marcela; Rego, Juliana Florinda M; Hoff, Paulo Marcelo Gehm (Ecancermedicalscience, 2020)