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Submitted on: 22 December 2002.
Revised on: 24 February 2003.
Accepted on: 20 April 2003.
___________________BEHAVIOURAL PHARMACOLOGY---LIPPINCOTT WILLIAMS & WILKINS
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Submitted on: 18 July 2004.
Revised on: 11 October 2004.
Accepted on: 04 November 2004.
___________________BEHAVIOURAL PHARMACOLOGY---LIPPINCOTT WILLIAMS & WILKINS
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