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http://reply.papertrans.cn/2/104/10350/10350-12.png
Submitted on: 09 June 2017.
Revised on: 25 August 2017.
Accepted on: 05 October 2017.
___________________Gaceta Sanitaria---ELSEVIER
http://reply.papertrans.cn/2/104/10350/10350-14.png
Submitted on: 22 May 2003.
Revised on: 22 July 2003.
Accepted on: 07 September 2003.
___________________Gaceta Sanitaria---ELSEVIER
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http://reply.papertrans.cn/2/104/10350/10350-17.png
http://reply.papertrans.cn/2/104/10350/10350-18.png
Submitted on: 23 December 2014.
Revised on: 12 January 2015.
Accepted on: 06 February 2015.
___________________Gaceta Sanitaria---ELSEVIER
Submitted on: 06 October 2009.
Revised on: 19 December 2009.
Accepted on: 19 January 2010.
___________________Gaceta Sanitaria---ELSEVIER