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Submitted on: 04 January 2000.
Revised on: 03 March 2000.
Accepted on: 04 April 2000.
___________________EUROPEAN JOURNAL OF PAIN---WILEY
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Submitted on: 06 November 2010.
Revised on: 17 February 2011.
Accepted on: 05 April 2011.
___________________EUROPEAN JOURNAL OF PAIN---WILEY
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