xrefs.add(convertXrefToStorage(geneTraitAssociation.getHpo(), "hpo")); putNotNull(d, GENE_TRAIT_PUBMEDS_FIELD, geneTraitAssociation.getNumberOfPubmeds()); putNotNull(d, GENE_TRAIT_TYPES_FIELD, geneTraitAssociation.getAssociationTypes()); putNotNull(d, GENE_TRAIT_SOURCES_FIELD, geneTraitAssociation.getSources());