Submitted on: 26 February 2012.
Revised on: 07 June 2012.
Accepted on: 21 July 2012.
___________________AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY
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Submitted on: 10 August 2001.
Revised on: 29 September 2001.
Accepted on: 09 November 2001.
___________________AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY
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Submitted on: 22 February 2012.
Revised on: 20 March 2012.
Accepted on: 29 April 2012.
___________________AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY