aDepartment of Psychology, National University of SingaporeArts Link, Singapore bCenter for Health and Medical Psychology (CHAMP), School of Law, Psychology and Social Work, Örebro University, Örebro, Sweden *Corresponding author. Address: Clinical and Health Psychology Centre (CHPC), Department of Psychology, National University of Singapore, 20 Lower Kent Ridge Road, 119080, Singapore. Tel.: (65) 6516 5348; fax: (65) 6773 1361. E-mail address: [email protected] (O. Sündermann). 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).