Recreate dataset with single merged articles.parquet and updated README

README.md

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+---
+pretty_name: MultiCaRe Articles
+license: cc-by-4.0
+task_categories:
+  - text-classification
+  - text-retrieval
+language:
+  - en
+size_categories:
+  - 10K<n<100K
+---
+
+# MultiCaRe Articles
+
+Per-article data with bibliographic metadata and abstracts.
+
+Files included:
+- `articles.parquet`: single table with metadata fields plus an `abstract` column
+
+Schema highlights:
+- article_id: PMCID (primary key)
+- title, journal, year
+- doi, pmid, pmcid
+- mesh_terms, major_mesh_terms, keywords
+- link, license, case_amount
+- abstract
+
+How to use:
+- Load `articles.parquet` to get article metadata and abstracts in one table.
+
+Join keys to other repos:
+- `article_id` ↔ `cases.article_id`, `images.article_id` (via cases)

abstracts.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:bfff658b16165f909fd75911ccde3fc4c82392801c78df38926e6e342282a814
+size 51822599

articles.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:138e4d442b817bb12f78a02a720a59815d3f5d66df74b7db7b10c5bf41db8ffd
+size 74231997

metadata.parquet

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+version https://git-lfs.github.com/spec/v1
+oid sha256:8eb3bc56125310a4a984a4817fefabb610c3817dd4c05a32423c477350f078af
+size 23170860