public function findByAccountIdentifierAndAuthenticationProviderName($accountIdentifier, $authenticationProviderName)
    {
        $query = $this->createQuery();
        return $query->matching(
            $query->logicalAnd(
                $query->equals('accountIdentifier', $accountIdentifier),
                $query->equals('authenticationProviderName', $authenticationProviderName)
            )
        )->execute()->getFirst();
    }