Urethra-sparing stereotactic body radiotherapy for prostate cancer: How much can the rectal wall dose be reduced with or without an endorectal balloon? - Björkqvist M.; Verbakel W.; Lencart J.; Linthout N.; Ozen Z.; Pérez-Moreno J.; Zilli T.; Escude L.; Miralbell R.; Dubouloz A.; Rouzaud M.; Tsvang L. (BioMed Central Ltd., 2022)