Submitted on: 22 July 2011.
Revised on: 01 August 2011.
Accepted on: 12 August 2011.
Lancet Regional Health-Americas
Submitted on: 19 December 2014.
Revised on: 03 January 2015.
Accepted on: 08 January 2015.
Lancet Regional Health-Americas
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Submitted on: 24 April 2002.
Revised on: 02 June 2002.
Accepted on: 16 June 2002.
Lancet Regional Health-Americas
Submitted on: 24 June 2004.
Revised on: 07 August 2004.
Accepted on: 14 August 2004.
Lancet Regional Health-Americas
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