Submitted on: 04 October 2004.
Revised on: 28 October 2004.
Accepted on: 13 November 2004.
REVISTA CLINICA ESPANOLA---EDICIONES DOYMA S A
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Submitted on: 06 February 2006.
Revised on: 01 March 2006.
Accepted on: 11 March 2006.
REVISTA CLINICA ESPANOLA---EDICIONES DOYMA S A
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