Accelerated Adaptation of Ultrahypofractionated Radiation Therapy for Breast Cancer at the Time of the COVID-19 Pandemic. Issue 3 (March 2021) - Machiels, M.; Weytjens, R.; Bauwens, W.; Vingerhoed, W.; Billiet, C.; Huget, P.; Verellen, D.; Dirix, P.; Meijnders, P.; Poortmans, P.; Kaidar-Person, O.