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Submitted on: 12 November 1999.
Revised on: 07 December 1999.
Accepted on: 13 January 2000.
___________________Frontiers in Pharmacology---FRONTIERS MEDIA SA
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Submitted on: 05 September 1999.
Revised on: 26 October 1999.
Accepted on: 05 December 1999.
___________________Frontiers in Pharmacology---FRONTIERS MEDIA SA
Submitted on: 31 March 1998.
Revised on: 01 July 1998.
Accepted on: 08 August 1998.
___________________Frontiers in Pharmacology---FRONTIERS MEDIA SA