As in [26], we compute the average number of mentions that a concept annotates (considering only used concepts from the whole ontology). As in [53] or [11], we analyze the number of NIL mentions, and we choose to use the percentage of NIL mentions to enable comparisons. Finally, as in [54], we compute the percentage of ambiguous mentions, that is, the percentage of mentions with the same surface forms that are annotated by different concepts. We also show the percentage of multi-normalization cases, that is, the mentions which should be normalized by two or more distinct concepts (including composite mentions in NCBI Disease Corpus).
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