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https://community.i2b2.org/wiki/display/DevForum/Ontology+Approaches+for+Federated+Query+SystemsInformation on how to modify a federated query system ontology for a local instance can be found here
https://community.i2b2.org/wiki/display/DevForum/Ontology+Approaches+for+Federated+Query+SystemsInformation on how to modify a federated query system ontology for a local instance can be found here