Development of a virtual phantom for HDR cervical cancer brachytherapy: A multi-institutional tool for training, quality assurance, and variability reduction. - Iijima K; Okamoto H; Ushijima T; Ueda Y; Oku Y; Toyota M; Ono Y; Takatsu J; Fukunaga JI; Murakami N; Ohno T (Journal of applied clinical medical physics, 2026)