Submitted on: 05 July 2011.
Revised on: 29 September 2011.
Accepted on: 23 November 2011.
___________________Brazilian Journal of Cardiovascular Surgery
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Submitted on: 21 January 2000.
Revised on: 29 March 2000.
Accepted on: 26 April 2000.
___________________Brazilian Journal of Cardiovascular Surgery
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Submitted on: 20 August 2007.
Revised on: 17 November 2007.
Accepted on: 06 January 2008.
___________________Brazilian Journal of Cardiovascular Surgery
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Submitted on: 20 January 2012.
Revised on: 09 May 2012.
Accepted on: 03 July 2012.
___________________Brazilian Journal of Cardiovascular Surgery
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Submitted on: 16 February 2000.
Revised on: 02 May 2000.
Accepted on: 07 June 2000.
___________________Brazilian Journal of Cardiovascular Surgery