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Submitted on: 16 November 2012.
Revised on: 28 December 2012.
Accepted on: 12 February 2013.
___________________HEART---BMJ PUBLISHING GROUP
Submitted on: 18 September 2011.
Revised on: 25 December 2011.
Accepted on: 21 February 2012.
___________________HEART---BMJ PUBLISHING GROUP
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Submitted on: 29 May 2005.
Revised on: 31 July 2005.
Accepted on: 14 August 2005.
___________________HEART---BMJ PUBLISHING GROUP
Submitted on: 24 July 2008.
Revised on: 30 September 2008.
Accepted on: 16 October 2008.
___________________HEART---BMJ PUBLISHING GROUP
Submitted on: 15 April 2011.
Revised on: 15 July 2011.
Accepted on: 28 August 2011.
___________________HEART---BMJ PUBLISHING GROUP
Submitted on: 29 May 2022.
Revised on: 19 June 2022.
Accepted on: 12 July 2022.
___________________HEART---BMJ PUBLISHING GROUP
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