http://reply.papertrans.cn/3/206/20512/20512-21.png
Submitted on: 09 December 2003.
Revised on: 12 January 2004.
Accepted on: 18 January 2004.
Lancet Regional Health-Americas
http://reply.papertrans.cn/3/206/20512/20512-23.png
Submitted on: 12 February 1998.
Revised on: 01 March 1998.
Accepted on: 26 March 1998.
Lancet Regional Health-Americas
http://reply.papertrans.cn/3/206/20512/20512-25.png
http://reply.papertrans.cn/3/206/20512/20512-26.png
Submitted on: 25 December 2018.
Revised on: 21 January 2019.
Accepted on: 30 January 2019.
Lancet Regional Health-Americas
http://reply.papertrans.cn/3/206/20512/20512-28.png
http://reply.papertrans.cn/3/206/20512/20512-29.png
http://reply.papertrans.cn/3/206/20512/20512-30.png