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. Author manuscript; available in PMC: 2015 Nov 13.
Published in final edited form as: Semant Web. 2015 Aug 7;6(4):403–422. doi: 10.3233/SW-140143

Fig. 2. Structure of the four top levels of the ontologies used in our research.

Fig. 2

The figure shows the structure for ICD-10, MeSH and SNOMED CT. The root node is displayed in black and bold in the middle of each plot. The figures show all ontology concepts up until a distance of four from the root node. Color indicates distance, with red being close to the root and blue being farther away. SNOMED CT (depth 16) is clearly broader than MeSH (depth 14), which stems from the fact that the latter contains roughly four times more concepts than the former.