Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article. Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden Department of Pain Management and Research, Oslo University Hospital, Oslo, Norway *Address: Department of Molecular Medicine and Surgery, Karolinska Institutet, 171 76 Stockholm, Sweden. Tel.: +46 852485435. E-mail address:[email protected] Article history: Received 22 January 2014; Received in revised form 18 July 2014; Accepted 18 July 2014.
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Per Hansson (2014) studied this question.