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Submitted on: 11 June 2006.
Revised on: 15 August 2006.
Accepted on: 03 September 2006.
___________________BULLETIN OF THE WORLD HEALTH ORGANIZATION
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Submitted on: 10 March 2012.
Revised on: 22 June 2012.
Accepted on: 25 July 2012.
___________________BULLETIN OF THE WORLD HEALTH ORGANIZATION
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http://reply.papertrans.cn/1/44/4396/4396-29.png
Submitted on: 20 March 2016.
Revised on: 16 July 2016.
Accepted on: 02 August 2016.
___________________BULLETIN OF THE WORLD HEALTH ORGANIZATION