Impact of hydrogel and hyaluronic acid rectal spacer on rectal dosimetry and toxicity in low-dose-rate prostate brachytherapy: a multi-institutional analysis of patients’ outcomes - Lin, Yuan-Hong; Loon, Wee; Tacey, Mark; Bolton, Damien; Tan, Alwin; Chan, Yee; Cham, Chee Wee; Ho, Huong; Guerrieri, Mario; Foroudi, Farshad; Joon, Daryl Lim; McMillan, Kevin; et al. (Journal of Contemporary Brachytherapy, 2021)