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Submitted on: 23 May 1998.
Revised on: 09 August 1998.
Accepted on: 05 October 1998.
___________________EUROPEAN NEUROPSYCHOPHARMACOLOGY
Submitted on: 27 November 2001.
Revised on: 27 February 2002.
Accepted on: 12 April 2002.
___________________EUROPEAN NEUROPSYCHOPHARMACOLOGY
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