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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 Creative Commons Attribution Non-Commercial License (<a href="http://creativecommons.org/licenses/by-nc/3.0/" target="_blank">http://creativecommons.org/licenses/by-nc/3.0/</a>), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.</p>