Submitted on: 24 October 2003.
Revised on: 17 December 2003.
Accepted on: 26 January 2004.
___________________Gaceta Sanitaria---ELSEVIER
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Submitted on: 11 May 2000.
Revised on: 10 June 2000.
Accepted on: 26 June 2000.
___________________Gaceta Sanitaria---ELSEVIER
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Submitted on: 12 January 2013.
Revised on: 15 March 2013.
Accepted on: 28 April 2013.
___________________Gaceta Sanitaria---ELSEVIER
Submitted on: 08 July 2002.
Revised on: 02 September 2002.
Accepted on: 17 September 2002.
___________________Gaceta Sanitaria---ELSEVIER
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Submitted on: 15 August 2024.
Revised on: 02 December 2024.
Accepted on: 16 December 2024.
___________________Gaceta Sanitaria---ELSEVIER
Submitted on: 03 March 2009.
Revised on: 14 June 2009.
Accepted on: 15 July 2009.
___________________Gaceta Sanitaria---ELSEVIER