eNanoMapper	Radiation Oncology Structures Ontology	Source
http://purl.obolibrary.org/obo/BTO_0001279	urn:absolute:RadiationOncologyStructuresOntology#Spinal_Cord	LOOM
http://purl.obolibrary.org/obo/BTO_0000759	urn:absolute:RadiationOncologyStructuresOntology#Liver	LOOM
http://purl.obolibrary.org/obo/BTO_0000269	urn:absolute:RadiationOncologyStructuresOntology#Colon	LOOM