Submitted on: 06 October 2014.
Revised on: 02 December 2014.
Accepted on: 08 January 2015.
___________________HEART---BMJ PUBLISHING GROUP
Submitted on: 29 April 2004.
Revised on: 10 August 2004.
Accepted on: 24 August 2004.
___________________HEART---BMJ PUBLISHING GROUP
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Submitted on: 12 September 2010.
Revised on: 23 October 2010.
Accepted on: 06 December 2010.
___________________HEART---BMJ PUBLISHING GROUP
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Submitted on: 22 August 2002.
Revised on: 01 November 2002.
Accepted on: 18 November 2002.
___________________HEART---BMJ PUBLISHING GROUP
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