Interstitial high-dose-rate brachytherapy as a boost in synchronous prostate and rectal cancer treatment: case report and literature review - Konat-Bąska, Katarzyna; Chicheł, Adam; Staszek-Szewczyk, Urszula; Maciejczyk, Adam; Matkowski, Rafał (Journal of Contemporary Brachytherapy, 2020)