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Submitted on: 03 September 2002.
Revised on: 01 October 2002.
Accepted on: 24 November 2002.
___________________CANADIAN JOURNAL OF PHYSIOLOGY AND PHARMACOLOGY
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Submitted on: 22 August 2000.
Revised on: 30 September 2000.
Accepted on: 24 November 2000.
___________________CANADIAN JOURNAL OF PHYSIOLOGY AND PHARMACOLOGY
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