Submitted on: 15 October 2012.
Revised on: 29 December 2012.
Accepted on: 30 January 2013.
___________________ACTA NEUROCHIRURGICA---SPRINGER WIEN
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Submitted on: 06 May 2014.
Revised on: 04 June 2014.
Accepted on: 16 June 2014.
___________________ACTA NEUROCHIRURGICA---SPRINGER WIEN
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