Abstract

Correspondence to: Ki-Eun KimDepartment of Dental Hygiene, College of Health Science, Eulji University, 553 Sanseong-daero, Sujung-gu, Seongnam 13135, KoreaTel: +82-31-740-7247, Fax: +82-31-740-7352, E-mail: hsun0405@naver.comCopyright © 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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