OligoMetastatic Cancer Ontology	Non-Randomized Controlled Trials Ontology	Source
http://www.semanticweb.org/admin/ontologies/OM#Follow_up	http://www.owl-ontologies.com/RCTOntology.owl#FollowUp	LOOM
http://www.semanticweb.org/admin/ontologies/OM#Population	http://www.owl-ontologies.com/RCTOntology.owl#Population	LOOM
http://www.semanticweb.org/admin/ontologies/OM#Procedure	http://www.owl-ontologies.com/RCTOntology.owl#Procedure	LOOM