I'm trying to extract all DOIDs (Disease Ontology IDs) and HP IDs (Human Phenotype Ontology IDs) that are annotated to a specific tissue type. For example, I want all the DOIDs and HPIDs annotated to ALL liver disorders. We already extracted the ones obtained by searching "liver" on http://disease-ontology.org/, however, they are not even close to complete.

We are currently manually extracting them by reading through the hierarchy, but we are looking for a more efficient way.

Any suggestions would be highly appreciated.

Thanks in advance.