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Submitted on: 16 September 2014.
Revised on: 10 December 2014.
Accepted on: 12 January 2015.
___________________HEALTH---SAGE PUBLICATIONS LTD
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Submitted on: 14 October 2007.
Revised on: 06 February 2008.
Accepted on: 04 April 2008.
___________________HEALTH---SAGE PUBLICATIONS LTD
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Submitted on: 21 October 1999.
Revised on: 05 January 2000.
Accepted on: 13 February 2000.
___________________HEALTH---SAGE PUBLICATIONS LTD
Submitted on: 19 November 2010.
Revised on: 26 December 2010.
Accepted on: 21 February 2011.
___________________HEALTH---SAGE PUBLICATIONS LTD