1. Department of Biological and Medical Psychology, University of Bergen, Bergen, Norway
2. Department of Psychology, University of Kentucky, Lexington, Kentucky, USA
3. Department of Physical Medicine and Rehabilitation, Harvard Medical School; Spaulding Rehabilitation Hospital and Spaulding Research Institute; & Home Base, A Red Sox Foundation and Massachusetts General Hospital Program, Charlestown, Massachusetts, USA
4. Division of Psychiatry, Haukeland University Hospital, Bergen, Norway