Abstract

Correspondence to: Min Jeong ChoPraha Dental Clinic, 2 Gobun-ro, Yeonje-gu, Busan 47576, KoreaTel: +82-51-861-2878~9, Fax: +82-51-861-2872, E-mail: bada964@hanmail.netCopyright © 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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