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Submitted on: 23 August 2003.
Revised on: 08 October 2003.
Accepted on: 20 November 2003.
___________________JOURNAL OF NEUROSURGERY---AMER ASSOC NEUROLOGICAL SURGEONS
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Submitted on: 26 June 2003.
Revised on: 30 September 2003.
Accepted on: 08 November 2003.
___________________JOURNAL OF NEUROSURGERY---AMER ASSOC NEUROLOGICAL SURGEONS
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Submitted on: 17 September 2011.
Revised on: 21 October 2011.
Accepted on: 31 October 2011.
___________________JOURNAL OF NEUROSURGERY---AMER ASSOC NEUROLOGICAL SURGEONS
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