Submitted on: 28 July 2000.
Revised on: 07 September 2000.
Accepted on: 20 September 2000.
___________________Journal of Physiological Sciences
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Submitted on: 25 December 2010.
Revised on: 10 February 2011.
Accepted on: 29 March 2011.
___________________Journal of Physiological Sciences
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Submitted on: 30 July 2003.
Revised on: 11 November 2003.
Accepted on: 27 November 2003.
___________________Journal of Physiological Sciences
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