Submitted on: 26 February 2000.
Revised on: 30 March 2000.
Accepted on: 21 April 2000.
Scandinavian Journal of Pain---WALTER DE GRUYTER GMBH
Submitted on: 05 September 2020.
Revised on: 19 September 2020.
Accepted on: 09 October 2020.
NULL
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