protected function _addSurveySourceAttributesToExportModel(\MUtil_Model_ModelAbstract $model, \Gems_Tracker_Survey $survey, array $data, array &$prefixes)
    {
        $source = $survey->getSource();
        $attributes = $source->getAttributes();
        $preExistingFields = $model->getColNames('label');
        $attributes = array_diff($attributes, $preExistingFields);

        foreach($attributes as $attribute) {
            $model->set($attribute, 'label', $attribute);
        }
    }