Submitted on: 17 March 2003.
Revised on: 06 May 2003.
Accepted on: 21 May 2003.
___________________BMJ Quality & Safety---BMJ PUBLISHING GROUP
Submitted on: 17 January 2004.
Revised on: 21 April 2004.
Accepted on: 30 May 2004.
___________________BMJ Quality & Safety---BMJ PUBLISHING GROUP
Submitted on: 22 October 2012.
Revised on: 18 November 2012.
Accepted on: 14 January 2013.
___________________BMJ Quality & Safety---BMJ PUBLISHING GROUP
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Submitted on: 27 January 2010.
Revised on: 04 March 2010.
Accepted on: 31 March 2010.
___________________BMJ Quality & Safety---BMJ PUBLISHING GROUP
Submitted on: 27 January 2024.
Revised on: 23 April 2024.
Accepted on: 02 June 2024.
___________________BMJ Quality & Safety---BMJ PUBLISHING GROUP
Submitted on: 24 March 2015.
Revised on: 10 July 2015.
Accepted on: 25 August 2015.
___________________BMJ Quality & Safety---BMJ PUBLISHING GROUP
Submitted on: 17 September 2006.
Revised on: 20 October 2006.
Accepted on: 12 December 2006.
___________________BMJ Quality & Safety---BMJ PUBLISHING GROUP
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