public function findFirstUsersByName($search)
    {
        return $this->_em->createQueryBuilder()
            ->select(
                'u.id',
                "CONCAT(u.firstName, ' ', u.lastName, ' (', u.username, ')') AS name"
            )
            ->from('ClarolineCoreBundle:User', 'u')
            ->where('u.firstName LIKE :search')
            ->orWhere('u.lastName LIKE :search')
            ->orWhere('u.username LIKE :search')
            ->setMaxResults(5)
            ->setParameter(':search', "%{$search}%")
            ->getQuery()
            ->getArrayResult();
    }