List all UCUM Unit Concepts from the Concept Table. To list UCUM Units specifically
related to the measurement of Time and Rate, see lookup_ucum_time
.
To list the UCUM Units used to process the Drug Strength table, see
ds_lookup_ucum
. The resultset is never cached.
lookup_ucum( conn, conn_fun = "connectAthena()", vocab_schema = "omop_vocabulary" )