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J Sleep Med in an Open Access journal, not for sale, but is freely distributed to members of Korean Sleep Research Society and relevant institutions. Full text PDF files are also freely available at the website (http://journal.sleepnet.or.kr). All articles are distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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