OC-0307 Results of the ESTRO plan quality assessment 2020 online survey. (August 2021) - Kaplan, L.P.; Placidi, L.; Bäck, A.; Hussein, M.; Canters, R.; Hernandez, V.; Fusella, M.; Piotrowski, T.; Vaniqui, A.; Hansen, C.R.; Widesott, L.