1Department of Psychiatry, Kyung Hee University Hospital, Seoul, Korea
2Department of Psychiatry, Kyung Hee University School of Medicine, Seoul, Korea

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.