Department of Anesthesiology and Pain Medicine, Ewha Womans University School of Medicine, Seoul, Korea.
Corresponding author: Jong In Han, Department of Anesthesiology and Pain Medicine, Ewha Womans University School of Medicine, 1071 Anyangcheon-ro, Yangcheon-gu, Seoul 158-710, Korea. Tel: 82-2-2650-5559, Fax: 82-2655-2924, hanji@ewha.ac.kr
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