Improving NER for Clinical Texts by Ensemble Approach using Segment Representations Hamada Nayel author H L Shashirekha author 2017-12 text Proceedings of the 14th International Conference on Natural Language Processing (ICON-2017) Sivaji Bandyopadhyay editor NLP Association of India Kolkata, India conference publication nayel-shashirekha-2017-improving https://aclanthology.org/W17-7525/ 2017-12 197 204