J Korean Neurosurg Soc. 2015;57(6):422-427.   Published online June 30, 2015
DOI: https://doi.org/10.3340/jkns.2015.57.6.422

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DOI: https://doi.org/10.3340/jkns.2007.41.3.200

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J Korean Neurosurg Soc. 1988;17(5):1029-1034.