1. Health Psychology Department, University Medical Centre Groningen, University of Groningen, Groningen, The Netherlands
2. Centre for Pediatric Pain Research, IWK Health Centre, Halifax, Canada
3. Pain Centre, Department of Anesthesiology, University Medical Centre Groningen, University of Groningen, Groningen, The Netherlands
4. Department of Psychology, Health and Technology, University of Twente, Enschede, The Netherlands