Get familiar with UMLS groups and semantic types

[ljgarcia]

The UMLS groups and semantic types can be useful to define the topics we want to use.
The groups are probably to broad and the types maybe to narrow so something in between would be a good idea.

[ljgarcia]

Some potential useful links:

• https://arxiv.org/abs/2109.13348
• https://www.researchgate.net/publication/352111871_Biomedical_Vocabulary_Alignment_at_Scale_in_the_UMLS_Metathesaurus
• https://www.researchgate.net/publication/11745260_Aggregating_UMLS_Semantic_Types_for_Reducing_Conceptual_Complexity