Submitted on: 26 December 2004.
Revised on: 05 April 2005.
Accepted on: 06 May 2005.
___________________BMJ Health & Care Informatics---BMJ PUBLISHING GROUP
Submitted on: 05 June 2007.
Revised on: 20 July 2007.
Accepted on: 02 August 2007.
___________________BMJ Health & Care Informatics---BMJ PUBLISHING GROUP
Submitted on: 18 December 2017.
Revised on: 11 April 2018.
Accepted on: 27 April 2018.
___________________BMJ Health & Care Informatics---BMJ PUBLISHING GROUP
Submitted on: 08 April 1999.
Revised on: 13 June 1999.
Accepted on: 26 July 1999.
___________________BMJ Health & Care Informatics---BMJ PUBLISHING GROUP
Submitted on: 10 February 2020.
Revised on: 17 April 2020.
Accepted on: 15 May 2020.
___________________BMJ Health & Care Informatics---BMJ PUBLISHING GROUP
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