Class tree view with starting class disease

Use the tree view to explore class hierarchy. The plus sign will expand the list if the hierarchy goes deeper. Selecting a class will show detailed information on the class.
disease [EUPH-code: 106]
bacterial disease (2 classes) [EUPH-code: 108]
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brood disease [EUPH-code: 8070]
diseased [EUPH-code: 3396]
fungal disease (2 classes) [EUPH-code: 70]
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protozoan disease (2 classes) [EUPH-code: 110]
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symptom (3 classes) [EUPH-code: 1089]
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viral disease (2 classes) [EUPH-code: 109]
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