aPain Prevention and Treatment Research Program, Duke University Medical Center, Box 3159, Durham, NC 27710, USA bDepartment of Psychology, University of Nevada-Reno, Reno, NV, USA *Corresponding author. Tel.: +1 919 668 2806. E-mail: [email protected] Submitted January 26, 2007; accepted February 5, 2007.
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Porter et al. (2007) studied this question.
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