Read Codes, Clinical Terms Version 3 (CTV3)	Research Network and Patient Registry Inventory Ontology	Source
http://purl.bioontology.org/ontology/RCD/X90MT	http://www.semanticweb.org/ontologies/2013/1/PCORI.owl#Approaches	LOOM
http://purl.bioontology.org/ontology/RCD/XC00J	http://www.semanticweb.org/ontologies/2013/1/PCORI.owl#Gender	LOOM
http://purl.bioontology.org/ontology/RCD/X7686	http://www.semanticweb.org/ontologies/2013/1/PCORI.owl#Age	LOOM
http://purl.bioontology.org/ontology/RCD/X901t	http://www.semanticweb.org/ontologies/2013/1/PCORI.owl#Source	LOOM