Download an example database which was simulated to include an example of a typical EMR database.
None. The database is saved under the name `sample_db` in the specified directory.
# \donttest{
emr_download_example_data()
#> Extracting data...
#> Downloaded example database to /tmp/Rtmp9qUkld/file1309ae21ce2b/reference/sample_db
# }