aCenter for Health and Medical Psychology (CHAMP), Department of Behavioral, Social and Legal Sciences, Psychology Örebro University, Örebro, Sweden
bPain Management Unit, Royal National Hospital for Rheumatic Diseases, Bath, UK
cDepartment of Psychology, University of Leuven, Leuven, Belgium
dDepartment of Clinical Psychological Science, University of Maastricht, Maastricht, Netherlands
*Corresponding author. Tel.: +46 19 6022456.
Submitted August 20, 2007; accepted October 1, 2007.