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Submitted on: 28 September 2013.
Revised on: 01 December 2013.
Accepted on: 27 January 2014.
___________________BMJ Health & Care Informatics---BMJ PUBLISHING GROUP
Submitted on: 23 January 2024.
Revised on: 11 May 2024.
Accepted on: 12 June 2024.
___________________BMJ Health & Care Informatics---BMJ PUBLISHING GROUP
Submitted on: 27 March 2001.
Revised on: 08 July 2001.
Accepted on: 26 August 2001.
___________________BMJ Health & Care Informatics---BMJ PUBLISHING GROUP