Pre-implant magnetic resonance and transrectal ultrasound imaging in high-dose-rate prostate brachytherapy: comparison of prostate volumes, craniocaudal extents, and contours - Grisotto, Simone; Cerrotta, Annamaria; Pappalardi, Brigida; Carrara, Mauro; Messina, Antonella; Tenconi, Chiara; Valdagni, Riccardo; Fallai, Carlo (Journal of Contemporary Brachytherapy, 2018)