Crossref reports a total of 80 million registered scholarly items, highlighting extensive research documentation.
As of this week, there are 80,000,000 scholarly items registered with Crossref! By the way, we update these interesting Crossref stats regularly and you can search the metadata.
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Ginny Hendricks (2016) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: