Abstract

Correspondence to: Jin-Young YangDepartment of Dental Hygiene, Daejeon Institute of Science and Technology, 100 Hyecheon-ro, Seo-gu, Daejeon 35408, KoreaTel: +82-42-580-6446, Fax: +82-42-581-6301, E-mail: prime@dst.ac.krCopyright © 2015 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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