Abstract
Correspondence to: Byung-Ho LeeDepartment of Dental Hygiene, Youngsan University, 288 Junam-ro, Yangsan 50510, KoreaTel: +82-55-380-9436, Fax: +82-55-380-9305, E-mail: leebh@ysu.ac.krCopyright © 2016 by the Korean Society of Dental Hygiene Science This is an Open Access article 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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