Submitted on: 10 July 2001.
Revised on: 14 August 2001.
Accepted on: 05 September 2001.
___________________BMJ Health & Care Informatics---BMJ PUBLISHING GROUP
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Submitted on: 30 July 2017.
Revised on: 13 October 2017.
Accepted on: 27 October 2017.
___________________BMJ Health & Care Informatics---BMJ PUBLISHING GROUP
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Submitted on: 04 April 1999.
Revised on: 17 June 1999.
Accepted on: 10 August 1999.
___________________BMJ Health & Care Informatics---BMJ PUBLISHING GROUP
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Submitted on: 09 May 2008.
Revised on: 24 July 2008.
Accepted on: 20 September 2008.
___________________BMJ Health & Care Informatics---BMJ PUBLISHING GROUP