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Submitted on: 19 June 2010.
Revised on: 13 August 2010.
Accepted on: 23 September 2010.
___________________Journal of Korean Neurosurgical Society
Submitted on: 24 October 2008.
Revised on: 02 January 2009.
Accepted on: 25 January 2009.
___________________Journal of Korean Neurosurgical Society
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