public function findAllExcept(array $excludedUser)
    {
        $dql = '
            SELECT u FROM Claroline\CoreBundle\Entity\User u
            WHERE u NOT IN (:userIds)
            AND u.isRemoved = false
        ';
        $query = $this->_em->createQuery($dql);
        $query->setParameter('userIds', $excludedUser);

        return $query->getResult();
    }