Update README.md

README.md

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-MedNorm2SnomedCT2UMLS
+MedNorm2SnomedCT2UMLS
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+Paper on Mednorm and harmonisation: https://aclanthology.org/W19-3204.pdf
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+The medical concept normalisation task aims to map textual descriptions to standard terminologies such as SNOMED-CT or MedDRA.
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+Existing publicly available datasets annotated using different terminologies cannot be simply merged and utilised, and therefore become less
+valuable when developing machine learningbased concept normalisation systems. 
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+To address that, we designed a data harmonisation pipeline and engineered a corpus of 27,979 textual descriptions simultaneously mapped to both MedDRA and SNOMED-CT, 
+sourced from five publicly available datasets across biomedical and social media domains.