. 2017 Jan 25;47(2):77–86. doi: 10.4041/kjod.2017.47.2.77
© 2017 The Korean Association of Orthodontists.
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.