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