National Drug Data File	Presence Ontology	Source
http://presence-ontology.org/ontology/Stethoscope	http://purl.bioontology.org/ontology/NDDF/004955	LOOM
http://presence-ontology.org/ontology/Event	http://purl.bioontology.org/ontology/STY/T051	LOOM
http://presence-ontology.org/ontology/MedicalDevice	http://purl.bioontology.org/ontology/STY/T074	LOOM