Submitted on: 14 September 2008.
Revised on: 29 November 2008.
Accepted on: 25 December 2008.
___________________AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE
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Submitted on: 24 March 2000.
Revised on: 27 April 2000.
Accepted on: 15 June 2000.
___________________AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE
Submitted on: 09 July 2012.
Revised on: 10 September 2012.
Accepted on: 10 October 2012.
___________________AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE
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Submitted on: 06 August 2009.
Revised on: 25 October 2009.
Accepted on: 11 December 2009.
___________________AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE
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Submitted on: 18 January 2008.
Revised on: 13 April 2008.
Accepted on: 10 May 2008.
___________________AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE