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Submitted on: 27 August 2006.
Revised on: 20 November 2006.
Accepted on: 25 December 2006.
___________________Infectious Disease Modelling---KEAI PUBLISHING LTD
Submitted on: 23 August 2007.
Revised on: 10 December 2007.
Accepted on: 05 January 2008.
___________________Infectious Disease Modelling---KEAI PUBLISHING LTD
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Submitted on: 08 October 2005.
Revised on: 05 January 2006.
Accepted on: 17 January 2006.
___________________Infectious Disease Modelling---KEAI PUBLISHING LTD
Submitted on: 27 April 2005.
Revised on: 25 July 2005.
Accepted on: 16 August 2005.
___________________Infectious Disease Modelling---KEAI PUBLISHING LTD