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The two most fundamental tasks in information extraction are discussed; namely, named entity recognition task and relation extraction task. The authors give details about the most used rule\/pattern-based and machine learning techniques for each task. They also make comparisons between these techniques and summarize the advantages and disadvantages of each one.<\/p>","DOI":"10.4018\/jitr.2015040101","type":"journal-article","created":{"date-parts":[[2015,6,5]],"date-time":"2015-06-05T18:54:31Z","timestamp":1433530471000},"page":"1-15","source":"Crossref","is-referenced-by-count":4,"title":["Information Extraction in the Medical Domain"],"prefix":"10.4018","volume":"8","author":[{"given":"Aicha","family":"Ghoulam","sequence":"first","affiliation":[{"name":"Department of Computer Science, University of Oran 1, Ahmed Ben Bella, Oran, Algeria"}]},{"given":"Fatiha","family":"Barigou","sequence":"additional","affiliation":[{"name":"Department of Computer Science, University of Oran 1, Ahmed Ben Bella, Oran, Algeria"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9694-7586","authenticated-orcid":true,"given":"Ghalem","family":"Belalem","sequence":"additional","affiliation":[{"name":"Department of Computer Science, University of Oran 1, Ahmed Ben Bella, Oran, Algeria"}]}],"member":"2432","reference":[{"key":"jitr.2015040101-0","unstructured":"Alphones, E., Aubin,S., Bessieres, P., Bisson, G., Hamon, T., Lagarrigue, S., Nazarenko, A., Manine, A., Nedellec, C., Abdel vetah, M., Poibeau, T., & Weissenbacher, D. 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