I'm looking for a list of research topics along with subtopics in health. Medline (https://medlineplus.gov/healthtopics.html) provides a good high-level list but if you click on any of the topics, you'll see TOO many detailed subtopics... Is there any other similar list that provides more aggregated subtopics?

I've found several other lists but they mostly include many subtopics without any clear organization/aggregation.

Thanks!

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