Returns an iterator over the PhenotypeAssociationSets on the server.

def search_phenotype_association_sets(self, dataset_id):
        """
        Returns an iterator over the PhenotypeAssociationSets on the server.
        """
        request = protocol.SearchPhenotypeAssociationSetsRequest()
        request.dataset_id = dataset_id
        request.page_size = pb.int(self._page_size)
        return self._run_search_request(
            request, "phenotypeassociationsets",
            protocol.SearchPhenotypeAssociationSetsResponse)