Sihan Wang Lei Li 0020 Xiahai Zhuang AttU-NET: Attention U-Net for Brain Tumor Segmentation. 302-311 2021 BrainLes@MICCAI (2) https://doi.org/10.1007/978-3-031-09002-8_27 conf/brainles-ws/2021-2 db/conf/brainles-ws/brainles-ws2021-2.html#WangLZ21