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Submitted on: 27 April 2012.
Revised on: 09 August 2012.
Accepted on: 08 October 2012.
___________________Global Public Health---ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
Submitted on: 27 February 2008.
Revised on: 20 March 2008.
Accepted on: 01 May 2008.
___________________Global Public Health---ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD