PO-1493 Opening the angle: the role played by National Societies for Radiation Oncology during the COVID-19. (August 2021) - Prades, J.; Borras, J.M.; Bibault, J.; Grau, C.; Jereczek-Fossa, B.A.; Lambrecht, M.; Slotman, B.J.; Troost, E.G.; Lievens, Y.