Update README.md

README.md

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 # HealthSearchQA
-Dataset of consumer health questions released by Google for the Med-PaLM paper
+Dataset of consumer health questions released by Google for the Med-PaLM paper ([arXiv preprint](https://arxiv.org/abs/2212.13138)).
+
+From the [paper](https://www.nature.com/articles/s41586-023-06291-2):
+
+We curated our own additional dataset consisting of 3,173 commonly searched consumer questions,
+referred to as  HealthSearchQA. The dataset was curated using seed medical conditions and their
+associated symptoms. We used the seed data to retrieve publicly-available commonly searched questions
+generated by a search engine, which were displayed to all users entering the seed terms. We publish the
+dataset as an open benchmark for answering  medical questions from consumers and hope this will be a useful
+resource for the community, as a dataset reflecting real-world consumer concerns.
+
+**Format:** Question only, free text response, open domain.
+
+**Size:** 3,173.
+
+**Example question:** How serious is atrial fibrillation?
+
+**Example question:** What kind of cough comes with Covid?
+
+**Example question:** Is blood in phlegm serious?