public function getRespondentName()
    {
        if (! isset($this->_respTrackData['grs_first_name'], $this->_respTrackData['grs_last_name'])) {
            $this->_ensureRespondentData();
        }

        return trim($this->_respTrackData['grs_first_name'] . ' ' . $this->_respTrackData['grs_surname_prefix']) . ' ' . $this->_respTrackData['grs_last_name'];
    }