Submitted on: 19 April 2020.
Revised on: 23 July 2020.
Accepted on: 04 September 2020.
___________________Asian Pacific Journal of Tropical Medicine
Submitted on: 20 May 1999.
Revised on: 24 July 1999.
Accepted on: 20 September 1999.
___________________Asian Pacific Journal of Tropical Medicine
Submitted on: 17 June 2017.
Revised on: 12 August 2017.
Accepted on: 23 September 2017.
___________________Asian Pacific Journal of Tropical Medicine
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Submitted on: 27 October 2005.
Revised on: 16 December 2005.
Accepted on: 16 January 2006.
___________________Asian Pacific Journal of Tropical Medicine
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