TIP in an Open Access journal, not for sale, but is freely distributed to members of Korean Association for Research, Procedures and Education on Trauma and relevant institutions. To subscribe to this journal or renew your current subscription, ask a copy of the subscription form via the office of Korean Association for Research, Procedures and Education on Trauma, and complete the subscription form and return it to us. Full text PDF files are also freely available at the website (http://www.traumaimpro.org). All articles are 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.