public function calculateHash()
    {
        $answerModel = $this->getAnswerModel('en');
        foreach($answerModel->getItemsOrdered() as $item) {
                $result = $answerModel->get($item, ['label', 'type', 'multiOptions', 'parent_question', 'thClass', 'group', 'description']);
                if (array_key_exists('label', $result)) {
                    $items[$item] = $result;
                }
        }

        $hash = md5(serialize($items));
        
        return $hash;
    }