Hierarchical Nested Named Entity Recognition Zita Marinho author Afonso Mendes author Sebastião Miranda author David Nogueira author 2019-06 text Proceedings of the 2nd Clinical Natural Language Processing Workshop Anna Rumshisky editor Kirk Roberts editor Steven Bethard editor Tristan Naumann editor Association for Computational Linguistics Minneapolis, Minnesota, USA conference publication marinho-etal-2019-hierarchical 10.18653/v1/W19-1904 https://aclanthology.org/W19-1904/ 2019-06 28 34