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Except where otherwise noted, this item's license is described as <p>This is an open-access article distributed under the terms of the <a href="http://creativecommons.org/licenses/by-nc-nd/4.0/">Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CCBY-NC-ND)</a>, where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially.</p>