Submitted on: 13 February 2014.
Revised on: 18 March 2014.
Accepted on: 15 April 2014.
___________________BMJ Health & Care Informatics---BMJ PUBLISHING GROUP
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Submitted on: 04 March 2010.
Revised on: 13 June 2010.
Accepted on: 05 August 2010.
___________________BMJ Health & Care Informatics---BMJ PUBLISHING GROUP
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Submitted on: 11 October 2017.
Revised on: 22 January 2018.
Accepted on: 16 February 2018.
___________________BMJ Health & Care Informatics---BMJ PUBLISHING GROUP
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