OC-0633 Cardiac substructure avoidance in lung cancer using photon vs proton radiotherapy: A planning study. (August 2021) - Banfill, K.; Wood, J.; Charlwood, F.; Lines, D.; Rompokos, V.; Hiley, C.; van Herk, M.; Faivre-Finn, C.; Schmitt, M.; Salem, A.; McWilliam, A.