Abstract
Received September 13, 2013. Accepted September 13, 2013. Correspondence to: Sang Wook Shin, MD Department of Anesthesia and Pain Medicine, Pusan National University School of Medicine, Beomeo-ri, Mulgeum-eup, Yangsan 626-770, Korea Tel: +82-55-360-2752, Fax: +82-55-360-2149, E-mail: shinsw@pusan.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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