An external validation of the Candiolo nomogram in a cohort of prostate cancer patients treated by external‐beam radiotherapy oleh Domenico Gabriele, Alessia Guarneri, Sara Bartoncini, Fernando Munoz, Matteo Tamponi, Filippo Russo, Georgios Stamatakos, Caterina Guiot, Daniele Regge, Umberto Ricardi