Submitted on: 16 November 1998.
Revised on: 03 March 1999.
Accepted on: 28 March 1999.
___________________Digital Health---SAGE PUBLICATIONS LTD
Submitted on: 10 November 2015.
Revised on: 01 February 2016.
Accepted on: 19 February 2016.
___________________Digital Health---SAGE PUBLICATIONS LTD
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