public function forRespondent($respondentId, $organizationId = null) {
        if (null !== $respondentId) {
            $this->sql_select->where('gto_id_respondent = ?', $respondentId);
        }
        if (null !== $organizationId) {
            $this->sql_select->where('gto_id_organization = ?', $organizationId);
        }

        return $this;
    }