Map an EFO trait id to a study accession identifier.
Value
A dataframe of two identifiers. First column is the EFO trait identifier and the second column is the study identifier.
Examples
if (FALSE) { # \dontrun{
# Map EFO trait identifiers to study identifiers
trait_to_study(c('EFO_0005108', 'EFO_0005109'))
} # }