Affiliation: | 1. Department of Neurosurgery, Samsung Medical Center, Sungkyunkwan University, School of Medicine, 50 Irwon-dong, Gangnam-gu, Seoul, 135-710, South Korea 2. School of Medicine, Keimyung University, 56 Dalseong-ro, Jung-gu, Daegu, 700-712, South Korea
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