Journal Article 2022 Medical Image AnalysisSegmentation only uses sparse annotations: Unified weakly and semi-supervised learning in medical imagesFeng GAO†*, Minhao Hu†, Min-Er ZHONG†, Shixiang Feng, Xuwei Tian, Xiaochun Meng, Ze-Ping HUANG, Min-Yi LV, Tao Song, Xiaofan Zhang*, Xiangguang Zou*, Xiaojian Wu* PMID DOI