XBound-Former: Toward Cross-Scale Boundary Modeling in Transformers. - Jiacheng Wang 002; Fei Chen 003; Yuxi Ma; Liansheng Wang; Zhaodong Fei; Jianwei Shuai; Xiangdong Tang; Qichao Zhou; Jing Qin 001 (IEEE Trans. Medical Imaging, 2023)