Submitted on: 02 September 2010.
Revised on: 26 December 2010.
Accepted on: 05 February 2011.
___________________Journal of Epidemiology and Global Health
Submitted on: 29 April 2016.
Revised on: 12 June 2016.
Accepted on: 03 July 2016.
___________________Journal of Epidemiology and Global Health
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Submitted on: 04 March 2002.
Revised on: 07 April 2002.
Accepted on: 28 May 2002.
___________________Journal of Epidemiology and Global Health
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Submitted on: 27 November 2013.
Revised on: 18 February 2014.
Accepted on: 04 April 2014.
___________________Journal of Epidemiology and Global Health
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Submitted on: 16 February 2007.
Revised on: 11 June 2007.
Accepted on: 01 July 2007.
___________________Journal of Epidemiology and Global Health