@RequestMapping(value = "/more", method = RequestMethod.POST)
    public String more(ModelMap modelMap, @ModelAttribute("number") Integer number, HttpSession session) {
        int numberOfElementsToDisplay = contentService.getAll().size();

        if (number * 2 < contentService.getAll().size()) {
            numberOfElementsToDisplay = number * 2;
        }
        session.setAttribute("number", numberOfElementsToDisplay);
        modelMap.addAttribute("contentList", contentService.getAll());
        modelMap.addAttribute("contentForm", new ContentForm());

        return "redirect:/questionnaire/list";
    }