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Submitted on: 27 May 2012.
Revised on: 19 August 2012.
Accepted on: 31 August 2012.
___________________Journal of Korean Neurosurgical Society
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Submitted on: 02 September 2018.
Revised on: 19 October 2018.
Accepted on: 25 November 2018.
___________________Journal of Korean Neurosurgical Society