The EUCTR provides one record per trial per EU Member State in which the trial is conducted. For all trials conducted in more than one Member State, this function returns only one record per trial.
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A data frame created from the database that includes the columns "_id" and "a2_eudract_number", for example created with function dbGetFieldsIntoDf(c("_id", "a2_eudract_number")).
Code of single EU Member State for which records
should returned. If not available, a record for GB or lacking this, any
other record for the trial will be returned. For a list of codes of EU
Member States, please see vector
A logical value if trials should be retained that are conducted exclusively in third countries, that is, outside the European Union.
Note: To deduplicate trials from different registers (EUCTR and CTGOV),
please first use function
A data frame as subset of
df corresponding to the sought
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