Challenge: Existing methods for named entity disambiguation are limited by coarse-grained structural resources in biomedical knowledge bases and training datasets that provide low coverage over uncommon resources.
Approach: They propose a method that integrates structural knowledge from general text knowledge bases to the medical domain.
Outcome: The proposed method improves disambiguation accuracy on two benchmark medical NED datasets by up to 57 points.

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Challenge: Existing methods for named entity recognition (NER) use labeled data for both source and target domains.
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