Submitted on: 15 August 2000.
Revised on: 04 December 2000.
Accepted on: 31 December 2000.
___________________Biomedica---INST NACIONAL SALUD - COLOMBIA
Submitted on: 09 November 2016.
Revised on: 07 December 2016.
Accepted on: 01 February 2017.
___________________Biomedica---INST NACIONAL SALUD - COLOMBIA
Submitted on: 02 July 2013.
Revised on: 29 October 2013.
Accepted on: 17 December 2013.
___________________Biomedica---INST NACIONAL SALUD - COLOMBIA
Submitted on: 25 January 1999.
Revised on: 14 May 1999.
Accepted on: 25 May 1999.
___________________Biomedica---INST NACIONAL SALUD - COLOMBIA
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Submitted on: 01 April 2019.
Revised on: 04 June 2019.
Accepted on: 05 July 2019.
___________________Biomedica---INST NACIONAL SALUD - COLOMBIA
Submitted on: 29 May 2013.
Revised on: 23 September 2013.
Accepted on: 16 November 2013.
___________________Biomedica---INST NACIONAL SALUD - COLOMBIA