Update README.md

README.md

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 This dataset consists of abstracts from heart-related papers collected from PubMed. It can be used for pre-training a language model specialized in cardiology. 
 The dataset was collected through the PubMed API, based on the names of heart-related journals and a glossary of cardiology terms.
 
-### Dataset Sources
-- **Repository:** [Pubmed](https://pubmed.ncbi.nlm.nih.gov/)
-- **Journal list:** [Scimago Journal & Country Rank](https://www.scimagojr.com/journalrank.php?category=2705#google_vignette)
-- **Glossary1 :** [National Institutes of Health](https://www.nia.nih.gov/health/heart-health/heart-health-glossary)
-- **Glossary2 :** [The Texas Heart Institute](https://www.texasheart.org/heart-health/heart-information-center/topics/a-z)  
-- **Glossary3 :** [Aiken Physicians Alliance](https://aikenphysicians.com/services/cardiology/cardiology-glossary-of-terms)  
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 # Dataset
 
 ## Data Sources