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Submitted on: 30 May 2002.
Revised on: 28 July 2002.
Accepted on: 29 August 2002.
___________________Iatreia---UNIV ANTIOQUIA, FAC MED
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Submitted on: 06 May 2008.
Revised on: 18 August 2008.
Accepted on: 07 October 2008.
___________________Iatreia---UNIV ANTIOQUIA, FAC MED
Submitted on: 18 February 2012.
Revised on: 27 May 2012.
Accepted on: 24 June 2012.
___________________Iatreia---UNIV ANTIOQUIA, FAC MED
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Submitted on: 11 August 2018.
Revised on: 17 November 2018.
Accepted on: 15 January 2019.
___________________Iatreia---UNIV ANTIOQUIA, FAC MED