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NOTE: This tool uses the QLever Wikidata SPARQL endpoint to detect if a DOI is missing in Wikidata. The endpoint is currently updated once every week when the latest official Wikidata dump is published. This is the query we used:

PREFIX wdt: <http://www.wikidata.org/prop/direct/> PREFIX wd: <http://www.wikidata.org/entity/> PREFIX wikibase: <http://wikiba.se/ontology#> PREFIX p: <http://www.wikidata.org/prop/> PREFIX ps: <http://www.wikidata.org/prop/statement/> SELECT ?orcid WHERE { wd:Q213416 p:P496 ?statement. ?statement a wikibase:BestRank. ?statement ps:P496 ?orcid. }