public function echoPdfByTokenId($tokenId)
    {
        $surveyId = $this->db->fetchOne('SELECT gto_id_survey FROM gems__tokens WHERE gto_id_token = ?', $tokenId);

        $pdf  = $this->getSurveyPdf($surveyId);

        $this->addTokenToDocument($pdf, $tokenId, $surveyId);

        foreach ($pdf->pages as $page) {
            $this->addTokenToPage($page, $tokenId);
        }

        $this->echoPdf($pdf, $tokenId . '.pdf');
    }