public function getFieldLabels()
    {
        $output = array(
            'gap_id_organization' => $this->_('Organization'),
            'gap_source'          => $this->_('Source of appointment'),
            'gap_id_attended_by'  => $this->_('With'),
            'gap_id_referred_by'  => $this->_('Referrer'),
            'gap_id_activity'     => $this->_('Activity'),
            'gap_id_procedure'    => $this->_('Procedure'),
            'gap_id_location'     => $this->_('Location'),
            'gap_subject'         => $this->_('Subject'),
        );

        asort($output);

        return $output;
    }