A Hierarchical Approach to Encoding Medical Concepts for Clinical Notes Yitao Zhang author 2008-06 text Proceedings of the ACL-08: HLT Student Research Workshop Ebru Arisoy editor Keisuke Inoue editor Wolfgang Maier editor Association for Computational Linguistics Columbus, Ohio conference publication zhang-2008-hierarchical https://aclanthology.org/P08-3012/ 2008-06 67 72