1. Department of Psychology, Health & Technology, University of Twente, AE Enschede, The Netherlands
2. Department of Clinical Psychology, VU University, VdBoechorststraat 1, 1082 BT Amsterdam, The Netherlands
3. Roessingh Research & Development, AH Enschede, The Netherlands
4. Department of Health Psychology, University Medical Center Groningen, RB Groningen, The Netherlands
5. Department of Otolaryngology/Head and Neck Surgery, VU University Medical Center; MB Amsterdam, The Netherlands