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Table 2 External ontologies cross-referenced in DDO

From: DDO: a diabetes mellitus diagnosis ontology

# Ontology Use in DDO Classes Object properties Data properties Total
Imported ontologies as whole
 1 BFO (Basic Formal Ontology) Top-level reference ontology 35 0 0 35
 2 OGMS (Ontology for General Medical Science) Mid-level reference ontology 120 0 0 120
Imported from other external ontologies
 1 DOID (Human Disease Ontology) Externally referenced disease classes 1760 0 0 1760
 2 SYMP (Symptoms Ontology) Select classes for symptoms 80 0 0 80
 4 UO (Units of Measurement Ontology) Laboratory tests units of measurements 37 1 0 38
 5 OBO RO (Relation ontology) Object properties design 0 19 0 19
 6 RxNorm ontology Externally referenced drugs and chemical substances 1042 drug + 1069 substance 0 0 2111
Imported from other external terminologies
 1 SNOMED CT Select classes to enhance granularity of diseases, drugs, substances, symptoms, etc. 1987 diseases, 72 symptoms, 83 laboratory tests, 1 disease course, 23 physical examinations, 5 diagnoses, 107 disorders, 23 living organisms (classes) 2301
 2 UMLS Selection of concepts UMLS CUIs for all concepts
Total 6444 20 0 6464