Abstract
Received November 15, 2012. Accepted November 16, 2012. Correspondence to: Jae Hang Shim, MD Department of Anesthesiology and Pain Medicine, School of Medicine, Hanyang University, 249-1 Kyomun-dong, Guri 471-701, Korea Tel: +82-31-560-2390, Fax: +82-31-563-1731, E-mail: jhshim@hanyang.ac.kr 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. Copyright c The Korean Pain Society, 2013 LETTER TO EDITORS
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