http://reply.papertrans.cn/3/206/20511/20511-21.png
http://reply.papertrans.cn/3/206/20511/20511-22.png
Submitted on: 19 October 1999.
Revised on: 08 November 1999.
Accepted on: 23 November 1999.
Lancet Regional Health-Americas
http://reply.papertrans.cn/3/206/20511/20511-24.png
Submitted on: 16 April 2019.
Revised on: 13 May 2019.
Accepted on: 01 June 2019.
Lancet Regional Health-Americas
Submitted on: 08 March 2016.
Revised on: 09 April 2016.
Accepted on: 20 April 2016.
Lancet Regional Health-Americas
Submitted on: 15 November 2000.
Revised on: 23 December 2000.
Accepted on: 09 January 2001.
Lancet Regional Health-Americas
http://reply.papertrans.cn/3/206/20511/20511-28.png
Submitted on: 03 August 2020.
Revised on: 16 September 2020.
Accepted on: 26 September 2020.
Lancet Regional Health-Americas
http://reply.papertrans.cn/3/206/20511/20511-30.png