Ontology of units of Measure	Exposure Ontology	Source
http://purl.obolibrary.org/obo/ExO_0000051	http://www.ontology-of-units-of-measure.org/resource/om-2/Frequency	LOOM
http://purl.obolibrary.org/obo/ExO_0000066	http://www.ontology-of-units-of-measure.org/resource/om-2/Unit	LOOM
http://purl.obolibrary.org/obo/ExO_0000054	http://www.ontology-of-units-of-measure.org/resource/om-2/Duration	LOOM