Double U-Net: semi-supervised ultrasound image segmentation combining CNN and transformer's U-shaped network. - Huabiao Zhou; Yanmin Luo; Jingjing Guo; Zhikui Chen; Wanyuan Gong; Zhongwei Lin; Minling Zhuo; Youjia Lin; Weiwei Lin; Qingling Shen (J. Supercomput., 2025)