Submitted on: 10 July 2010.
Revised on: 07 August 2010.
Accepted on: 01 October 2010.
___________________Gaceta Sanitaria---ELSEVIER
http://reply.papertrans.cn/2/104/10352/10352-12.png
http://reply.papertrans.cn/2/104/10352/10352-13.png
Submitted on: 20 July 2010.
Revised on: 29 September 2010.
Accepted on: 28 October 2010.
___________________Gaceta Sanitaria---ELSEVIER
http://reply.papertrans.cn/2/104/10352/10352-15.png
http://reply.papertrans.cn/2/104/10352/10352-16.png
Submitted on: 11 July 2015.
Revised on: 12 September 2015.
Accepted on: 11 October 2015.
___________________Gaceta Sanitaria---ELSEVIER
http://reply.papertrans.cn/2/104/10352/10352-18.png
http://reply.papertrans.cn/2/104/10352/10352-19.png
Submitted on: 15 July 2022.
Revised on: 28 October 2022.
Accepted on: 05 December 2022.
___________________Gaceta Sanitaria---ELSEVIER