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Submitted on: 09 September 2006.
Revised on: 03 December 2006.
Accepted on: 28 January 2007.
___________________ACTA NEUROBIOLOGIAE EXPERIMENTALIS
Submitted on: 12 February 2000.
Revised on: 07 May 2000.
Accepted on: 04 July 2000.
___________________ACTA NEUROBIOLOGIAE EXPERIMENTALIS