J Korean Neurosurg Soc. 2014;55(2):92-95.   Published online February 28, 2014
DOI: https://doi.org/10.3340/jkns.2014.55.2.92

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DOI: https://doi.org/10.3340/jkns.2011.50.2.126

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J Korean Neurosurg Soc. 2005;38(2):155-157.

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J Korean Neurosurg Soc. 1992;21(9):1203-1207.