Submitted on: 06 January 1998.
Revised on: 27 January 1998.
Accepted on: 24 February 1998.
___________________BMC Medical Informatics and Decision Making
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Submitted on: 21 July 2013.
Revised on: 16 October 2013.
Accepted on: 09 November 2013.
___________________BMC Medical Informatics and Decision Making
Submitted on: 18 April 2021.
Revised on: 30 June 2021.
Accepted on: 19 July 2021.
___________________BMC Medical Informatics and Decision Making
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