Submitted on: 17 July 2000.
Revised on: 26 August 2000.
Accepted on: 16 October 2000.
___________________Anales del Sistema Sanitario De Navarra
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Submitted on: 03 March 2018.
Revised on: 24 March 2018.
Accepted on: 06 April 2018.
___________________Anales del Sistema Sanitario De Navarra
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