Submitted on: 22 November 2014.
Revised on: 19 March 2015.
Accepted on: 25 April 2015.
___________________EUROPEAN JOURNAL OF PAIN---WILEY
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Submitted on: 07 November 2015.
Revised on: 11 December 2015.
Accepted on: 07 January 2016.
___________________EUROPEAN JOURNAL OF PAIN---WILEY