aWestern Sydney University, School of Science and Health, Sydney NSW, Australia bDepartment of Pain Medicine, Liverpool Hospital, Liverpool, NSW, Australia cWestern Sydney University, School of Social Sciences and Psychology, Sydney NSW, Australia Corresponding author. Address: Department of Pain Medicine, Liverpool Hospital, Locked Bag 7103, Liverpool BC NSW 1871, Australia. Tel: +61 28738 7200; fax: +61 28738 7205. E-mail address: [email protected] (B. Brady). Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article. Supplemental digital content is available for this article. Direct URL citations appear in the printed text and are provided in the HTML and PDF versions of this article on the journal's Web site (www.painjournalonline.com). Received May 20, 2015 Received in revised form October 14, 2015 Accepted October 30, 2015
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