Opportunities and Challenges Presented by Wikidata in the Context of Biocuration
The Unified Medical Language System (UMLS): integrating biomedical terminology
Freebase: a collaboratively created graph database for structuring human knowledge
Wikidata: a free collaborative knowledgebase
DBpedia - A crystallization point for the Web of Data
Effective mapping of biomedical text to the UMLS Metathesaurus: the MetaMap program