1 School of Medicine, Johns Hopkins University, Baltimore, MD, USA Department of Psychology, University of Regina, Regina, Saskatchewan, Canada Department of Rehabilitation, Maastricht University, Maastricht, The Netherlands Department of Psychology, Arizona State University, Phoenix, AZ, USA Department of Physical Therapy, University of Texas, Health Sciences Center, San Antonio, TX, USA Department of Psychology, McGill University, Montreal, Quebec, Canada Department of Anaesthesia, Harvard School of Medicine, Boston, MA, USA.