Abstract

Correspondence to: Su-Young LeeDepartment of Dental Hygiene, Namseoul University, 91 Daehak-ro, Seonghwan-eup, Seobuk-gu, Cheonan 31020, Korea Tel: +82-41-580-2560, Fax: +82-41-580-2927, E-mail: batty96@nsu.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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