Update README.md

README.md

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 ## 💡 Key Highlights
-*   We open-source a large-scale instruction dataset [**EHR-Ins**](data_url), including 3.5M non-reasoning data and 300k reasoning data.
+*   We open-source a large-scale instruction dataset [**EHR-Ins**](https://huggingface.co/datasets/BlueZeros/EHR-Ins-Reasoning), including 3.5M non-reasoning data and 300k reasoning data.
 *   We open-source a comprehensive benchmark [**EHR-Bench**](https://huggingface.co/datasets/BlueZeros/EHR-Bench), which covers 42 distinct EHR analysis tasks.
 *   We open-source EHR reasoning-enhanced LLMs **EHR-R1**, including [**EHR-R1-1.7B**](https://huggingface.co/BlueZeros/EHR-R1-1.7B), [**EHR-R1-8B**](https://huggingface.co/BlueZeros/EHR-R1-8B), and [**EHR-R1-72B**](https://huggingface.co/BlueZeros/EHR-R1-72B).
 *   We open-source the "thinking-graph" pipeline, which can synthesize reasoning chains for EHR analysis tasks according to the relation of EHR entities.