RefineCatDiff: Toward High-Quality Medical Image Segmentation via a Categorical Diffusion Refinement Framework. - Feng Liu 062; Hongjian Yu; Jiaan Huang; Xin Hua; Hengjia Liu; Zhimian Ma; Zhen Wang; Zhijiang Du; Lining Sun (Adv. Intell. Syst., 2025)