Barriers and facilitators for omitting parts of locoregional treatment in older patients with early stage breast cancer from the patient's perspective. Issue 2 (February 2019) - de Boer, A.; de Glas, N.A.; Bastiaannet, E.; Souwer, E.T.D.; Portielje, J.E.A.; Liefers, G.J.; van Bodegom-Vos, L.; Marang-van de Mheen, P.J.