Download a vector of dates on which a ClinicalTrials.gov registry entry was updated
A character string including a well-formed ClinicalTrials.gov NCT Number, e.g. "NCT00942747". (A capitalized "NCT" followed by eight numerals with no spaces or hyphens.)
A vector of ISO-8601 formatted dates corresponding to the dates on which there were clinical trial history version updates.
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## Not run: versions <- clinicaltrials_gov_dates("NCT00942747") ## End(Not run)
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